Question

A conducting sphere of radius 4×10^-3 has a charge 6.66pc.find workdone in bringing a unit charge to the surface of the sphere from infinity

Answer 1

Answer

Charge on sphere Q=6.66pC

Radius R=4×10^-3 m

Other charge is unit

So work done is given by

W=$\frac{KQQ'}{r}$

Putting all values

$W=$ $\frac{9\times10^9\times6.66\times10^{-12}}{4\times10^{-3}}$

W=14.86J