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1. 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. 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
(c) 10 V m
(d) 20 V m.

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