Q. 14.6( 19 Votes )

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 10 V m–1. If the plastic plate is replaced by a copper plate of the same geometrical dimensions and carrying the same charge Q, the electric field at the point P will become
A. zero

B. 5 V m–1

C. 10 V m–1

D. 20 V m–1

Answer :

A large plastic plate and copper plate is an example of infinite long plates.

As we know,

The electric field due to infinite long sheet is


σ is the surface charge density of the thin conducting sheet

ε0 is the permittivity of the free space

The electric field due to the plastic plate is 10 Vm-1

Thus, the electric field for the copper would be same as that of the plastic plate.

The electric field of the copper plate id 10 Vm-1

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