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Q.

It is required to hold equal charges q in equilibrium at the corners of a square. What charge when placed at the center of the square will do this?

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a

−q2(1+22)

b

q2(1+22)

c

q4(1+22)

d

−q4(1+22)

answer is C.

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Detailed Solution

AC=2l=BDor BO=12FBO=FBD+(FBA+FBC)cos450solving, we getQ=q4(1+22) Q should be negative of q.
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