Four charges q 2q -4q are placed in cyclic order at the four corners of a square of side a the net field at the centre of the square is
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Explanation:
field due to a single charge Q at a distance r. Also, you would know its direction. Now, apply this to each of the 4 charges, taking r = d sqrt(2). Make sure you use the correct directions for each charge and add the resulting vectors (it will be easier to add them in pairs: the q and -4q together and the 2q and 2q together.)
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