Question

A charge $Q$ is uniformly distributed over a large square plate of copper. The electric field at a point very close to the centre of the plate is 10 $Vm^{ -1}$. If the copper plate is replaced by a plastic plate of the same geometrical dimensions and carrying the same charge $Q$ uniformly distributed, then the electric field at the point $P$ will be

• A. 5 $Vm^{ -1}$
• B. zero
• C. 10 $Vm^{ -1}$
• D. 20 $Vm^{ -1}$

Answer 1

Answer: (C)

10 $Vm^{ -1}$

Answer 2

Electric field will remain same as charge density $\sigma$ remain same $( E = \sigma / \varepsilon_0 )$.