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Q.

As per this diagram a point charge y + q is placed at the origin O. Work A done in taking another point charge - Q from the point A (0, a) to another point B (a, 0) along the straight path AB is :

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a

-qQ4πε02a

b

Zero

c

qQ4πε01a212

d

qQ4πε01a22a

answer is B.

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