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Electrostatics Questions

Practice 115 Electrostatics questions with detailed answers and explanations. Free MCQs, PYQs, and mock test questions for NEET, JEE, GATE, SSC and more.

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23
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67
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25
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Practice by Exam:Physics(112)PHYSICS(3)

About Electrostatics — practice questions, PYQs & concepts

Electrostatics is a frequently-tested topic on Physics, PHYSICS. ExamTest.live currently lists 115 Electrostatics questions spanning previous-year papers from 2026 to 2026, each with worked solutions and a step-by-step explanation. Use the filters on this page to focus on a specific exam, difficulty level or year — every answer key is free, no sign-up required.

Electrostatics weight in competitive exams

Across our Electrostatics question bank, the largest sources are Physics (112) and PHYSICS (3). Click any exam chip above to drill down to that exam-specific question set.

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All Electrostatics Questions(1–100 of 115)

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Q1hardmcqPhysicsAIEEE 20042026
50% accuracy
Four charges equal to are placed at the four corners of a square and a charge is at its centre. If the system is in equilibrium, the value of is:
Q2mediummcqPhysicsAIEEE 20042026
0% accuracy
A charged particle is shot towards another charged particle which is fixed. With a speed , it approaches up to a closest distance and then returns. If were given a speed , the closest distance of approach would be:
Q3mediummcqPhysicsAIEEE 20042026
0% accuracy
Two spherical conductors and having equal radii and carrying equal charges repel each other with a force when kept apart at some distance. A third spherical conductor having same radius as that of but uncharged is brought in contact with , then brought in contact with and finally removed away from both. The new force of repulsion between and is:
Q4easymcqPhysicsAIEEE 20042026
0% accuracy
A charged oil drop is suspended in a uniform field of so that it neither falls nor rises. The charge on the drop will be: (Take mass of the drop and )
Q5mediummcqPhysicsAIEEE 20072026
0% accuracy
If and are the accelerations due to gravity on the surfaces of the earth and the moon respectively and if Millikan's oil drop experiment could be performed on the two surfaces, one will find the ratio of electronic charge on the moon to electronic charge on the earth to be:
Q6mediummcqPhysicsAIEEE 20072026
0% accuracy
A parallel plate condenser with a dielectric of dielectric constant between the plates has a capacity and is charged to a potential volts. The dielectric slab is slowly removed from between the plates and then reinserted. The net work done by the system in this process is:
Q7mediummcqPhysicsAIEEE 20062026
0% accuracy
Two spherical conductors and of radii and are separated by a distance of and are uniformly charged. If the spheres are connected by a conducting wire, then in equilibrium, the ratio of the magnitude of the electric fields at the surface of spheres and is:
Q8mediummcqPhysicsAIEEE 20072026
0% accuracy
An electric charge is placed at the origin of co-ordinate system. Two points and are situated at and respectively. The potential difference between the points and will be:
Q9mediummcqPhysicsAIEEE 20072026
0% accuracy
A battery is used to charge a parallel plate capacitor till the potential difference between the plates becomes equal to the electromotive force of the battery. The ratio of the energy stored in the capacitor and the work done by the battery will be:
Q10mediummcqPhysicsNEET 20192026
0% accuracy
Two parallel infinite line charges with linear charge densities and are placed at a distance of in free space. What is the electric field mid-way between the two line charges?
Q11mediummcqPhysicsNEET 20192026
0% accuracy
Two point charges and , having charges and respectively, are placed at certain distance apart and force acting between them is . If charge of is transferred to , then force between the charges becomes:
Q12mediummcqPhysicsNEET 20192026
0% accuracy
A parallel plate capacitor of capacitance is being charged by a voltage source whose potential is changing at the rate of . The conduction current through the connecting wires, and the displacement current through the plates of the capacitor, would be, respectively:
Q13hardmcqPhysicsNEET (UG) 20172026
0% accuracy
Suppose the charge of a proton and an electron differ slightly. One is , the other is . If the net electrostatic force and gravitational force between two hydrogen atoms at distance is zero, then is of the order of: (Mass of hydrogen )
Q14mediummcqPhysicsAIEEE 20062026
0% accuracy
Two infinitely large insulating plates are uniformly charged such that the potential difference between them is . The plates are separated by . An electron is released from rest on the inner surface of plate 1. What is its speed when it hits plate 2? (, )
image
Q15mediummcqPhysicsAIEEE 20072026
0% accuracy
The potential at a point (measured in ) due to some charges situated on the -axis is given by Volts. The electric field at is given by:
Q16mediummcqPhysicsAIEEE 20072026
0% accuracy
Charges are placed at the vertices of a square respectively. Let be the electric field and the potential at the centre. If the charges on and are interchanged with those on and respectively, then:
image
Q17easymcqPhysicsAIEEE 20062026
0% accuracy
An electric dipole is placed at an angle of to a non-uniform electric field. The dipole will experience:
Q18mediummcqPhysicsNEET 20192026
0% accuracy
A hollow metal sphere of radius is uniformly charged. The electric field due to the sphere at a distance from the centre:
Q19easymcqPhysicsNEET 20222026
Two hollow conducting spheres of radii and () have equal charges. The potential would be:
Q20hardmcqPhysicsNEET 20222026
A capacitor of capacitance is charged fully by battery. Then the battery is disconnected and the capacitor is connected to another uncharged capacitor of capacitance . The electrostatic energy stored by the system is:
image
Q21mediummcqPhysicsNEET 20232026
An electric dipole is placed at an angle of with an electric field of intensity . It experiences a torque equal to . Calculate the magnitude of charge on the dipole, if the dipole length is .
Q22mediumassertion/reasoningPhysicsNEET (UG) 20242026
Given
Q23easymcqPhysicsAIEEE 20032026
If the electric flux entering and leaving an enclosed surface respectively is and , the electric charge inside the surface will be:
Q24mediummcqPhysicsNEET (UG) 20242026
If the plates of a parallel plate capacitor connected to a battery are moved close to each other, then:A. the charge stored in it, increases.B. the energy stored in it, decreases.C. its capacitance increases.D. the ratio of charge to its potential remains the same.E. the product of charge and voltage increases.Choose the most appropriate answer:
Q25mediummcqPhysicsAIEEE2026
A charged ball hangs from a silk thread which makes an angle with a large charged conducting sheet , as shown in the figure. The surface charge density of the sheet is proportional to:
image
Q26hardmcqPhysicsAIEEE 20032026
Three charges , and are placed as shown in the figure. ( at origin, at , at ). The -component of the force on is proportional to:
image
Q27mediummcqPhysicsNEET 20212026
A dipole is placed in an electric field as shown. In which direction will it move?
image
Q28mediummcqPhysicsNEET 20212026
Twenty seven drops of same size are charged at each. They combine to form a bigger drop. Calculate the potential of the bigger drop.
Q29easymcqPhysicsNEET 20222026
Two point charges and are placed at a distance of , as shown in the figure. The magnitude of electric field intensity at a distance () varies as:
image
Q30mediummcqPhysicsAIEEE 20032026
The work done in placing a charge of coulomb on a condenser of capacity micro-farad is:
Q31easymcqPhysicsNEET 20232026
The equivalent capacitance of the system shown in the following circuit is:
image
Q32hardmcqPhysicsNEET 20232026
An electric dipole is placed as shown in the figure. The electric potential (in ) at point P due to the dipole is ():
image
Q33easymcqPhysicsNEET (UG) 20242026
A thin spherical shell is charged by some source. The potential difference between the two points (center) and (on the surface) shown in the figure is (Take , , ):
image
Q34hardmcqPhysicsAIEEE 20122026
Statement 1: When a charge is taken from the centre to the surface of an insulating solid sphere of radius and uniform charge density , its potential energy changes by .Statement 2: The electric field at a distance from the centre of the sphere is .
Q35hardmcqPhysicsAIEEE 20032026
A thin spherical conducting shell of radius has a charge . Another charge is placed at the centre of the shell. The electrostatic potential at a point at a distance from the centre of the shell is:
Q36hardmcqPhysicsAIEEE2026
Two thin wire rings each having a radius are placed at a distance apart with their axes coinciding. The charges on the two rings are and . The potential difference between the centres of the two rings is:
Q37mediummcqPhysicsJEE Main2026
A charge is uniformly distributed over a long rod of length . The electric potential at the point lying at a distance from the end (where are collinear) is:
Q38easymcqPhysicsAIEEE 20032026
A sheet of aluminium foil of negligible thickness is introduced between the plates of a capacitor. The capacitance of the capacitor:
Q39mediummcqPhysicsJEE Main2026
Two capacitors and are charged to and respectively. It is found that by connecting them together the potential on each one can be made zero. Then:
Q40hardmcqPhysicsNEET 20172026
Suppose the charge of a proton and an electron differ slightly. One of them is , the other is . If the net of electrostatic force and gravitational force between two hydrogen atoms placed at a distance (much greater than atomic size) apart is zero, then is of the order of [Given mass of hydrogen ]:
Q41hardmcqPhysicsFIITJEE AIEEE 2011 (Set Q)2026
The electrostatic potential inside a charged spherical ball is given by where is the distance from the centre; are constants. Then the charge density inside ball is:
Q42easymcqPhysicsNEET 20172026
The diagrams below show regions of equipotentials. A positive charge is moved from to in each diagram.
image
Q43mediummcqPhysicsAIEEE 20122026
In a uniformly charged sphere of total charge and radius , the electric field is plotted as a function of distance from the centre. The graph which would correspond to the above will be:
image
Q44easymcqPhysicsNEET 20172026
A capacitor is charged by a battery. The battery is removed and another identical uncharged capacitor is connected in parallel. The total electrostatic energy of resulting system:
Q45easymcqPhysicsNEET (UG) 20182026
The electrostatic force between the metal plates of an isolated parallel plate capacitor having a charge and area , is:
Q46mediummcqPhysicsAIEEE2026
A thin semi-circular ring of radius has a positive charge distributed uniformly over it. The net electric field at the centre is:
image
Q47hardmcqPhysicsNEET (UG) 20182026
A toy car with charge moves on a frictionless horizontal plane surface under the influence of a uniform electric field . Due to the force , its velocity increases from to in one second duration. At that instant the direction of the field is reversed. The car continues to move for two more seconds under the influence of this field. The average velocity and the average speed of the toy car between to seconds are respectively:
Q48hardmcqPhysicsAIEEE2026
Let there be a spherically symmetric charge distribution with charge density varying as up to , and for . The electric field at a distance from the origin is given by:
Q49mediummcqPhysicsAIEEE2026
A parallel plate capacitor with air between the plates has a capacitance of . The separation between its plates is ‘ ’. The space between the plates is now filled with two dielectrics. One has and thickness while the other has and thickness . Capacitance of the capacitor is now:
Q50mediummcqPhysicsAIEEE2026
Two identical charged spheres are suspended by strings of equal lengths. The strings make an angle of with each other. When suspended in a liquid of density , the angle remains the same. If density of the material of the sphere is , the dielectric constant of the liquid is:
Q51mediummcqPHYSICSNEET 20192026
Two metal spheres, one of radius and the other of radius respectively have the same surface charge density . They are brought in contact and separated. What will be the new surface charge densities on them?
Q52mediummcqPhysicsAIEEE2026
Two point charges and are located at and respectively. The location of a point on the x-axis at which the net electric field due to these two point charges is zero is:
Q53hardmcqPhysicsFIITJEE AIEEE 2011 (Set Q)2026
Two identical charged spheres suspended from a common point by two massless strings of length are initially a distance () apart because of their mutual repulsion. The charge begins to leak from both the spheres at a constant rate. As a result the charges approach each other with a velocity . Then as a function of distance between them:
Q54mediummcqPhysicsAIEEE 20092026
A charge is placed at each of the opposite corners of a square. A charge is placed at each of the other two corners. If the net electrical force on is zero, then the equals:
Q55mediummcqPHYSICSNEET 20192026
Two identical capacitors and of equal capacitance are connected as shown in the circuit. Terminals and of the key are connected to charge capacitor using a battery of emf volt. Now disconnecting and terminals, terminals and are connected. Due to this, what will be the percentage loss of energy?
image
Q56easymcqPHYSICSNEET 20192026
A sphere encloses an electric dipole with charges . What is the total electric flux through the sphere?
Q57mediummcqPhysicsAIEEE 20092026
This question contains Statement-1 and Statement-2. Of the four choices given after the statements,
choose the one that best describes the two statements.
Statement – 1: For a charged particle moving from point P to point Q, the net work done by an
electrostatic field on the particle is independent of the path connecting point P to point Q.
Statement-2: The net work done by a conservative force on an object moving along a closed loop is
zero
Q58mediummcqPhysicsNEET 2020 E12026
A spherical conductor of radius has a charge of distributed uniformly. What is the magnitude of electric field at a point from the centre of the sphere?()
Q59mediummcqPhysicsNEET 20212026
A parallel plate capacitor has a uniform electric field in the space between the plates. If the distance between the plates is and the area of each plate is , the energy stored in the capacitor is: ()
Q60mediummcqPhysicsJEE Main2026
Two charges, each equal to , are kept at and on the -axis. A particle of mass and charge is placed at the origin. If charge is given a small displacement () along the -axis, the net force acting on the particle is proportional to:
Q61easymcqPhysicsNEET 2020 E12026
In a certain region of space with volume , the electric potential is found to be throughout. The magnitude of electric field in this region is:
Q62easymcqPhysicsNEET 20222026
The angle between the electric lines of force and the equipotential surface is:
Q63mediummcqPhysicsAIEEE 20092026
Let be the charge density distribution for a solid sphere of radius and total charge . For a point ' ' inside the sphere at distance from the centre of the sphere, the magnitude of electric field is:
Q64mediummcqPhysicsAIEEE2026
A thin spherical shell of radius has charge spread uniformly. Which graph represents the electric field for ?
Q65hardmcqPhysicsNEET 2020 E12026
The capacitance of a parallel plate capacitor with air as medium is . With the introduction of a dielectric medium, the capacitance becomes . The permittivity of the medium is:()
Q66easymcqPhysicsNEET 20232026
If over a surface, then:
Q67hardmcqPhysicsNEET 2020 E12026
A short electric dipole has a dipole moment of . The electric potential due to the dipole at a point at a distance of from the centre of the dipole, situated on a line making an angle of with the dipole axis is:()
Q68mediummcqPhysicsNEET (UG) 20242026
In the following circuit, the equivalent capacitance between terminal A and terminal B is:
image
Q69mediummcqPhysicsAIEEE 20092026
Two points and are maintained at the potentials of and respectively. The work done in moving electrons from to is:
Q70mediummcqPhysicsNEET 20212026
Polar molecules are the molecules:
Q71mediummcqPhysicsNEET 20212026
The equivalent capacitance of the combination shown in the figure is:
image
Q72mediummcqPhysicsNEET 20212026
Two charged spherical conductors of radius and are connected by a wire. Then the ratio of surface charge densities of the sphere is:
Q73mediummcqPhysicsPhysics
3% accuracy
An electric dipole with dipole moment is aligned with the direction of a uniform electric field of magnitude . The dipole is then rotated through an angle of with respect to the electric field. The change in the potential energy of the dipole is:
Q74mediummcqPhysicsPhysics
0% accuracy
A parallel plate capacitor made of circular plates is being charged such that the surface charge density on its plates is increasing at a constant rate with time. The magnetic field arising due to displacement current is:
Q75mediummcqPhysicsPhysics
0% accuracy
The plates of a parallel plate capacitor are separated by . Two slabs of different dielectric constant and with thickness and , respectively are inserted in the capacitor. Due to this, the capacitance becomes two times larger than when there is nothing between the plates. If , the value of is:
Q76hardmcqPhysicsPhysics
0% accuracy
Two identical charged conducting spheres A and B have their centres separated by a certain distance. Charge on each sphere is and the force of repulsion between them is . A third identical uncharged conducting sphere is brought in contact with sphere A first and then with B and finally removed from both. New force of repulsion between spheres A and B (Radii of A and B are negligible compared to the distance of separation so that for calculating force between them they can be considered as point charges) is best given as:
Q77mediummcqPhysicsPhysics
0% accuracy
Two charges q1 and q2 are placed 30 cm apart, as shown in the figure. A third charge q3 is moved along the arc of a circle of radius 40 cm from C to D. The change in the potential energy of the system is (q3/4πε0)k, where k is :

image
Q78mediummcqPhysicsPhysics
0% accuracy
A charge is enclosed by a Gaussian spherical surface of radius . If the radius is doubled, then the outward electric flux will:
Q79mediummcqPhysicsPhysics
0% accuracy
Four electric charges and are placed at the corners of a square of side . The electric potential at point , midway between the two charges and , is:
image
Q80mediummcqPhysicsPhysics
25% accuracy
A parallel plate condenser has a uniform electric field (V/m) in the space between the plates. If the distance between the plates is (m) and area of each plate is (), the energy (joules) stored in the condenser is:
Q81mediummcqPhysicsPhysics
What is the flux through a cube of side ‘ ’ if a point charge of is at one of its corners?
Q82hardmcqPhysicsPhysics
Charges and are placed at points and , respectively; distance apart. is the midpoint. The work done in moving a charge along the semicircle is:
Q83hardmcqPhysicsPhysics
Two pith balls carrying equal charges are suspended from a common point by strings of equal length. The equilibrium separation between them is . Now the strings are rigidly clamped at half the height (). The equilibrium separation between the balls now becomes:
image
Q84easymcqPhysicsPhysics
and are three points in a uniform electric field directed along the positive x-axis. is further left than , and is further left than . The electric potential is:
image
Q85mediummcqPhysicsPhysics
Two charges q1 and q2 are placed 30 cm apart, as shown in the figure. A third charge q3 is moved along the arc of a circle of radius 40 cm from C to D. The change in the potential energy of the system is (q3/4πε0)k, where k is :
Q86mediummcqPhysicsPhysics
The energy required to charge a parallel plate condenser of plate separation and plate area of cross-section such that the uniform electric field between the plates is , is:
Q87easymcqPhysicsPhysics
Two thin dielectric slabs of dielectric constants and () are inserted between plates of a parallel plate capacitor. The variation of electric field ' ' between the plates with distance ' ' as measured from plate is correctly shown by:
image
image
Q88easymcqPhysicsPhysics
A conducting sphere of radius is given a charge . The electric potential and the electric field at the centre of the sphere respectively are:
Q89mediummcqPhysicsPhysics
A thin conducting ring of radius is given a charge . The electric field at the centre of the ring due to the charge on the part of the ring is . The electric field at the centre due to the charge on the part of the ring is:
Q90mediummcqPhysicsPhysics
In a region the potential is represented by , where is in volts and are in meters. The electric force experienced by a charge of situated at point is:
Q91mediummcqPhysicsPhysics
A parallel plate air capacitor has capacity , distance of separation between plates is and potential difference is applied between the plates. Force of attraction between the plates of the parallel plate air capacitor is:
Q92mediummcqPhysicsPhysics
The electric potential at a point in free space due to a charge coulomb is volts. The electric field at that point is:
Q93hardmcqPhysicsPhysics
If potential (in volts) in a region is expressed as , the electric field (in N/C) at point is:
Q94hardmcqPhysicsPhysics
image
A capacitor of is charged as shown in the diagram. When the switch is turned to position 2, the percentage of its stored energy dissipated is:
Q95hardmcqPhysicsPhysics
Three concentric spherical shells have radii and () and have surface charge densities and respectively. If and denote the potentials of the three shells, then for , we have:
Q96hardmcqPhysicsPhysics
Two identical charged spheres suspended from a common point by two massless strings of lengths , are initially at a distance apart because of their mutual repulsion. The charges begin to leak from both the spheres at a constant rate. As a result, the spheres approach each other with a velocity . Then varies as a function of the distance between the spheres, as:
Q97mediummcqPhysicsPhysics
An electric dipole is placed at an angle of with an electric field intensity . It experiences a torque equal to . The charge on the dipole, if the dipole length is , is:
Q98easymcqPhysicsPhysics
Two infinitely long parallel conducting plates having surface charge densities and respectively, are separated by a small distance. The medium between the plates is vacuum. If is the dielectric permittivity of vacuum, then the electric field in the region between the plates is:
Q99easymcqPhysicsPhysics
Three capacitors each of capacitance and of breakdown voltage are joined in series. The capacitance and breakdown voltage of the combination will be:
Q100hardmcqPhysicsPhysics
A parallel-plate capacitor of area , separation and capacitance is filled with four dielectric materials as shown. If a single dielectric material is to be used to have the same capacitance , then its dielectric constant is:
image
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