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VMMC VMMC Medical Solved Paper-2009

  • question_answer
    If the circumference of a sphere is 2 m, then capacitance of sphere in water would be

    A)  2700 pF

    B)                                                         2760pF                

    C)                         2780 pF                               

    D)                         2800 pF

    Correct Answer: D

    Solution :

    Given, circumference \[2\pi r=2\] Now, capacitance of a sphere \[4\pi {{\varepsilon }_{0}}r\] \[\therefore \]  \[C=4{{\varepsilon }_{0}}\] Capacitance of sphere in water = KC \[=K(4{{\varepsilon }_{0}})=80\times 4\times 8.85\times {{10}^{-12}}\] [As \[{{K}_{waer}}=80\]] \[\simeq 2800\,pF\]


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