A spherical conductor of radius 2 cm is uniformly charged with 3 nC. What is the electric field at a distance of 3 cm from the centre of the sphare ?

Options

A. `3 xx 10^(6)V m^(-1)`
B. `3 Vm^(-1)`
C. `3 xx 10^(4) Vm^(-1)`
D. `3 xx 10^(-4) V.m^(-1)`

Answer

C

Explanation

`E = 9 xx 10^(9) xx (q)/(r^(2)) " "(because E = (1)/(4pi epsilon_(0))(q)/(r^(2)))`
`E = (9 xx 10^(9) xx 3 xx 10^(-9))/((3 xx 10^(-2))^(2)) = 3 xx 10^(4) V//m`