A charge \( q \) is uniformly distributed over a large plastic plate. The electric field at a po...

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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 and just above the surface of the plate is \( 50 \mathrm{~V} / \mathrm{m} \). If the plastic plate is replaced by a copper plate of the same geometrical dimensions and carrying the same uniform charge q, the electric field at the point P will become:
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