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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 \( 10 \mathrm{~V} \mathrm{~m}^{-1} \). 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) \( 5 \mathrm{Vm}^{-1} \)
(c) \( 10 \mathrm{Vm}^{-1} \)
(d) \( 20 \mathrm{~V} \mathrm{~m}^{-1} \).
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