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JEE Main & Advanced Physics Electrostatics & Capacitance Question Bank Self Evaluation Test - Electrostatic Potential and Capacitance

  • question_answer
    Three charges -q, +q and +q are situated in X-Y plane at points (0, -a), (0, 0) and (0, a) respectively. The potential at a point distant r (r>a) in a direction making an angle \[\theta \]from Y-axis will be

    A) \[\frac{Kq}{r}\left( 1-\frac{2a\cos \theta }{r} \right)\]

    B) \[\frac{2kq\cos \theta }{{{r}^{2}}}\]

    C) \[\frac{Kq}{r}\]

    D) \[\frac{Kq}{r}\left( 1+\frac{2a\cos \theta }{r} \right)\]

    Correct Answer: D

    Solution :

    [d] \[V=\frac{Kq.2a\cos \theta }{{{r}^{2}}}+\frac{Kq}{r}=\frac{Kq}{r}\left[ \frac{2a\cos \theta }{r}+1 \right]\]


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