The number of electrons to be put on a spherical conductor of radius 0.1 m to produce an electric field of 0.036 N/C just above its surface is

Given data: spherical conductor of radius 0.1 m to produce an electric field of 0.036 N/c

Detailed solution:

Magnitude of charge on one electron q=e 

Hence, magnitude of charge on n electrons is q=ne 

$E=\frac{kq}{R^2}$ 

 $E=\frac{Kne}{R^2}$ 

 $E=\frac{9\times {10}^9\times n\times 1.6\times {10}^{-19}}{(0.1{)}^2}$ 

 $\Rightarrow 0.036=\frac{9\times {10}^9\times n\times 1.6\times {10}^{-19}}{(0.1{)}^2}$ 

 $n=2.5\times {10}^5$