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Q.

Three charges Q , +q  and +q  are placed at the vertices of a right angled isosceles triangle as shown The 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 should be zero.U=kQqa+kq2a+kQqa2=0⇒kqaQ+q+Q2=0  ⇒Q+q+Q2=0  ⇒Q1+12=-q ⇒Q2+12=-q⇒Q=-q21+2=-q21+222    ⇒Q=−2q2+2
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