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Question

Four point charges -Q,-q,2q and 2Q are placed, one at each corner of the square. The relation between Q and q fo which the potential at the centre of the square is zero, is
  1. Q=q
  2. Q=1q
  3. Q=q
  4. Q=1q

A
Q=q
B
Q=q
C
Q=1q
D
Q=1q
Solution
Verified by Toppr

Let the side of the square be =a
Potential at centre
Vc=K×Qa2+K×qa2+K×2qa2+K×2Qa2
0=KQa2+Kqa2
Q=q
Option (C) is correct

956766_793831_ans_fa82c66aed2d4e5e99b40aa8d3882993.jpg

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