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Q.

Three charges Q, +q and +q are placed at the vertices of a right angled isosceles triangle as shown in Fig. The net electrostatic energy of 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

U=u1+u2+u3

u=kQqa+q2a−Qq2a=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 in Fig. The net electrostatic energy of configuration is zero, if Q is equal to: