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Q.

At the four corners ABCD of a square, four charges are arranged as shown in the figure. Find the force on the charge kept at the centre O.

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a

perpendicular to side AB

b

Balong the diagonal BD

c

along the diagonal AC

d

zero

answer is B.

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Detailed Solution

According to coulomb's law,F=kq1q2r2Force due to charge at A and C are equal and opposite. Hence will cancel each other.The magnitude of force due to charge at B and D are same but their directions are same along the diagonal BD.
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At the four corners ABCD of a square, four charges are arranged as shown in the figure. Find the force on the charge kept at the centre O.