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Four charges are arranged at the corners of a square ABCD of side d, as shown in Fig. 2.15.(a) Find
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Four charges are arranged at the corners of a square ABCD of side d, as shown in Fig. 2.15.(a) Find the work required to put together this arrangement. (b) A charge qo is brought to the centre E of the square, the four charges being held fixed at its corners. How much extra work is needed to do this?
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