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  4. A charge Q is uniformly distributed over a large square plate of copper. The electric field at a point very close to the centre of the plate is 10 Vm -1. If the copper plate is replaced by a plastic plate of the same geometrical dimensions and carrying the same charge Q uniformly distributed, then the electric field at the point P will be

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Q. A charge $Q$ is uniformly distributed over a large square plate of copper. The electric field at a point very close to the centre of the plate is 10 $ Vm^{ -1}$. If the copper plate is replaced by a plastic plate of the same geometrical dimensions and carrying the same charge $Q$ uniformly distributed, then the electric field at the point $P$ will be

BHUBHU 2009Electric Charges and Fields

Solution:

Electric field will remain same as charge density $\sigma$ remain same $( E = \sigma / \varepsilon_0 )$.