QUESTIONS

The distance between two horizontal parallel plates is $2.0 cm$ and the potential difference between them is $120 V$ Calculate: force on an electron passing in between the plates.

The distance between two horizontal parallel plates is $2.0 cm$ and the potential difference between them is $120 V$ Calculate: increase in electrical energy of the electron in moving from one plate to the other.

An $\propto -$particle at rest is accelerated through ${10}^6 V$ . If a proton be accelerated through the same potential difference, then how much kinetic energy will it gain?
 

An $\propto -$particle at rest is accelerated through ${10}^6 V$. Which particle will gain more velocity if both start from rest?

(ii) A charge $q_0$ is brought from infinity to the centre of the square, the four charges being held fixed at its comers. How much extra work is needed to do this?

An electric dipole of length $2 \mathrm{cm}$ is placed with its axis making an angle of $60°$to a uniform electric field of ${10}^5 N\mathit{-}{C}^{\mathit{-}\mathit{1}}$. If it experiences a torque of $8 \sqrt{3} N\mathit{-}m$, calculate potential energy of the dipole.

Two point charges of $+3 \mathrm{\mu C}$ and $-3 \mathrm{\mu C}$ are at a distance $3 \times {10}^{-3} \mathrm{m}$ apart from each other. Calculate the electric potential at distance of 0.6m from the dipole in broad-side on position and at the same point after rotating the dipole through $90°$.

A hollow spherical conductor of radius $12 \mathrm{cm}$ is given a charge of $2.4 \times {10}^{-9} C$. Calculate the intensity of electric field in air at a distance of $4 \mathrm{m}$ from the centre of the sphere.