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JEE Main & Advanced Sample Paper JEE Main Sample Paper-32

  • question_answer
    Three charges \[+Q,+q\] and \[+q\] are placed at the vertices of a right angle triangle (isosceles triangle) as shown. The net electrostatic energy of the configuration is zero, if Q is equal to:

    A) \[\frac{q}{1+\sqrt{2}}\]

    B)    \[\frac{-2q}{2+\sqrt{2}}\]

    C) \[-2q\] 

    D)    \[+q\]

    Correct Answer: B

    Solution :

    \[U=K\left[ \frac{{{q}^{2}}}{a}+\frac{Qq}{a\sqrt{2}}+\frac{Qq}{a} \right]=0\]                 For \[Q=\frac{-2q}{2+\sqrt{2}}\]


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