NEET 2020 Exam Paper (180 Q) - Mock Test

A spherical conductor of radius $10\text{cm}$ has a charge of $3.2\times 10^{-7}\text{C}$ distributed uniformly. What is the magnitude of electric field at a point $15\text{cm}$ from the centre of the sphere?($\frac{1}{4\pi {ϵ}_0}=9\times 10^9{\text{N m}}^2{\text{/C}}^2$)

In a certain region of space with volume $0.2{\text{m}}^3$, the electric potential is found to be $5\text{V}$ throughout. The magnitude of electric field in this region is:

The increase in the width of the depletion region in a p-n junction diode is due to:

A $40\mu \text{F}$ capacitor is connected to a $200\text{V}$, $50\text{Hz}$ ac supply. The rms value of the current in the circuit is, nearly:

The mean free path for a gas, with molecular diameter $d$ and number density $n$ can be expressed as: