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JEE Main & Advanced Physics Electrostatics & Capacitance Question Bank Charge and Coulombs Law

  • question_answer
    Two small conducting spheres of equal radius have charges \[+10\mu C\] and \[-20\mu C\] respectively and placed at a distance \[R\] from each other experience force \[{{F}_{1}}\]. If they are brought in contact and separated to the same distance, they experience force \[{{F}_{2}}\]. The ratio of \[{{F}_{1}}\] to \[{{F}_{2}}\] is [MP PMT 2001]

    A)            1 : 8                                          

    B)            ? 8 : 1

    C)            1 : 2                                          

    D)            ? 2 : 1

    Correct Answer: B

    Solution :

               \[F\propto {{Q}_{1}}{{Q}_{2}}\] Þ \[\frac{{{F}_{1}}}{{{F}_{2}}}=\frac{{{Q}_{1}}{{Q}_{2}}}{Q_{1}^{'}Q_{2}^{'}}=\frac{10\times -\,20}{-5\times -\,5}=-\frac{8}{1}\]


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