Question

The electric field above a uniformly charged non-conducting sheet is E. If the non-conducting sheet is now replaced by a conducting sheet, with the charge same as before, the new electric field at the same point is:

• A. 2E
• B. E
• C. $\frac{E}{2}$
• D. None

Answer 1

The correct option is B. 2E.

Electric field due to a uniformly charged non-conducting sheet is given by,

$E=\frac{\sigma }{2{ϵ}_o}$---------(1)

And electric field due to a uniformly charged conducting sheet is given by,

$E_c=\frac{\sigma }{{ϵ}_o}$-----------(2)

Therefore, from 1 and 2 we can say

$E_c=2E$.