Four point charges –Q, –q, 2q and 2Q are placed, one at each corner of the square. The relation between Q and q for which the potential at the centre of the square is zero is:
A
Q = –q
B
C
Q = q
D
Text Solution
Verified by ExpertsThe correct answer is:
A
Let the side length of square be 'a' then potential at center O is
= – Q – q + 2q + 2Q = 0
= Q + q = 0
= Q = – q
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