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Q.

Four point charges each of magnitude q are kept as shown. ABCD is a square of side a2. The electrostatic force on the charge at the centre O is:

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a

2kq22a2

b

kq22a2

c

kq2a2

d

Zero

answer is A.

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Detailed Solution

Length of half diagonal= a

The forces due to A and D get cancelled.

Net force is due to charge at C = Kq2a2

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