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A 500 muC charge is at the centre of a ...

`A 500 muC` charge is at the centre of a square of side 10 cm. Find the work done in moving a charge of `10 muC` between two diagonally opposite points on the square.

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Work done is zero because electrostatic potential energy of the system for charge `q. = 10 muC` at two diagonally opposite points (say A and C) is exactly the same.
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