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Question

The charges Q, +q and +q are placed at the vertices of an equilateral triangle of side l. If the net electrostatic energy of the system is zero, then Q is equal to :
  1. q2
  2. +q2
  3. q
  4. Zero

A
q
B
+q2
C
Zero
D
q2
Solution
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E=2kQqr+kq2r=0
Q=q2

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