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Three charges Q, +q and +q are placed at the vertices of a right angle triangle (isoscles triangle) as shown. The net electrostatic energy of the configuration is zero, if Q is equal to : A. `(-q)/(1+sqrt(2))`B. `(-2q)/(2+sqrt(2))`C. `-2q`D. `+q` |
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Answer» Correct Answer - B Net electrostatic energy of the configuration will be `U=K[(q.q)/a+(Q.q)/sqrt(2a)+(Q.q)/q]=OrArr Q=(-2q)/(2+sqrt(2))` |
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