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JCECE Engineering JCECE Engineering Solved Paper-2013

  • question_answer
    If a charge \[-150\,\,nC\] is given to a concentric spherical shell and a charge \[+50\,\,nC\] is placed at its centre, then the charge on inner and outer surface of the shell is

    A) \[50\,\,nC,\,\,100\,\,nC\]            

    B) \[-50\,\,nC,\,\,-100\,\,nC\]

    C) \[50\,\,nC,\,\,200\,\,nC\]            

    D)  \[-50\,\,nC,\,\,-200\,\,nC\]

    Correct Answer: B

    Solution :

    The charge \[+\,\,50\,\,nC\] at the centre induces\[-\,\,50\,\,nC\] on inner surface and \[+\,\,50\,\,nC\] on outer surface of the spherical sheet. So, charge on the inner surface\[=-\,\,50\,\,nC\]. and charge on the outer surface\[=-\,\,150\,\,nC+\,\,50\,\,nC\] \[=-\,\,100\,\,nC\]


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