A uniform electric field and a uniform magnetic field are acting along the same direction in a certain region. If an electron is projected along the d - Physics MCQ AIEEE 2026 | ExamTest.live

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A uniform electric field and a uniform magnetic field are acting along the same direction in a certain region. If an electron is projected along the direction of the fields with a certain velocity then:

Solution & Step-by-step Explanation

1. Magnetic Field (B): The force F_{m} = - e (v \times B) . Since v and B are parallel, v \times B = 0 . The magnetic field exerts no force.2. Electric Field (E): The force F_{e} = - e E . Since the electron is moving in the direction of E, the electric force acts in the opposite direction (against the motion).Result: The electron will be decelerated, and its velocity will decrease.

Try it yourself before checking the explanation above.

A uniform electric field and a uniform magnetic field are acting along the same direction in a certain region. If an electron is projected along the direction of the fields with a certain velocity then:

its velocity will decrease.

its velocity will increase.

it will turn towards right of direction of motion.

it will turn towards left of direction of motion.

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