Q.

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

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a

−q1+2

b

−2q2+2

c

−2q

d

+q

answer is B.

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Detailed Solution

Net electrostatic energy U=kQqa+kq2a+kQqa2=0⇒kqaQ+q+Q2=0⇒Q=−2q2+2
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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