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Q.

A charge Q is uniformly distributed over a large plastic plate. The electric field at point P close to
centre of plate is 10 V m-1. If the plastic plate is replaced by copper plate of the same geometrical
dimension and carrying the same charge Q, then the electric field at that point will be [CG PMT 2015)

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a

zero

b

5  Vm-1

c

20 Vm-1

d

10 Vm-1

answer is C.

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Detailed Solution

Electric field at centre of plastic sheet is the same as at close to the centre of the copper plate.

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