The charge given to a hollow sphere of radius `10 cm` is `3.2 xx 10^(-19)` coulomb. At a distance of `4 cm` from its centre, the electric potetnial will be

Options

A. `28.8 xx 10^(-9)` volts
B. `288` volts
C. `2.88` volts
D. Zero

Answer

A

Explanation

Potential is to be determined at a distance of `4 cm` from centre of sphere i.e., inside the sphere.
`V = (kq)/(r ) = (9 xx 10^(9) xx 3.2 xx 10^(-19))/(10 xx 10^(-2)) = 28.8 xx 10^(-9)` volts