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KVPY Sample Paper KVPY Stream-SX Model Paper-8

  • question_answer
    Condenser \[A\] has a capacity of \[15\mu F\] which it is filled with a medium of dielectric constant 15. Another condenser B has a capacity of \[1\mu F\]with air between the plates. Both are charged separately by a battery of 100 V. After charging, both are connected in parallel without the battery and the dielectric medium being removed. The common potential now is

    A) \[400V\]            

    B) \[800\text{ }V\]

    C) \[1200\text{ }V\]                       

    D) \[1600\text{ }V\]

    Correct Answer: B

    Solution :

    the capacitance of condenser \[A\] without Dielectric will be,
     \[C=\frac{15}{15}=1\mu F.\]
    Common potential, \[V=\frac{15\times 100+1\times 100}{1+1}\]\[=800V.\]


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