A charge Q is uniformly distributed over a large plastic plate. The electric field at a point P close to the centre of the plate is `10V m^(-1)`. If the plastic plate is replaced by a copper plate of the same geometrical dimension and carryin the same charge `Q` the electric field at the point P will become

Options

A. Zero
B. `5Vm^(-1)`
C. `10 V m^(-1)`
D. `20 Vm^(-1)`

Answer

C

Explanation

Let A area of each plate `E_1=(Q//A)/(2e_0) & E_2=2. (Q//2)/(2e_0)=E_1`