As per diagram, a charge q is placed at the origin O. Work done by a charge - Q in taking it from A(0,a) to B(a,0) along the path AB :
zero
√2a(qQ4πε0a2)
(−qQ4πε0a2)√2a
(qQ4πε0a2)a√2
A
√2a(qQ4πε0a2)
B
(qQ4πε0a2)a√2
C
zero
D
(−qQ4πε0a2)√2a
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