1.

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]

A.            \[\frac{-q}{1+\sqrt{2}}\]
B.            \[\frac{-2q}{2+\sqrt{2}}\]
C.            \[-2q\]
D.            \[+q\]
Answer» C.            \[-2q\]


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