Electrostatics Question 419

Question: Three charges Q,+q and +q are placed at the vertices of a right-angled isosceles triangle as shown. The net electrostatic energy of the configuration is zero if Q is equal to [IIT-JEE (Screening) 2000]

Options:

A) q1+2

B) 2q2+2

C) 2q

D) +q

Show Answer

Answer:

Correct Answer: B

Solution:

Net electrostatic energy U=kQqa+kq2a+kQqa2=0

kqa(Q+q+Q2)=0

therefore Q=2q2+2



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