Electrostatics Question 440

Question: Three 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 [MP PET 2001]

Options:

A) (q2)

B) (q)

C) (+q)

D) Zero

Show Answer

Answer:

Correct Answer: A

Solution:

Potential energy of the system U=kQql+kq2l+kqQl=0

therefore kql(Q+q+Q)=0

therefore Q=q2



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