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

  • question_answer
    The capacitance of a metallic sphere is \[1\mu F\], then it?s radius is nearly

    A) 1.11 m

    B) 10 m

    C) 9 km    

    D) 1.11 cm

    Correct Answer: C

    Solution :

    [c] \[4\pi {{\varepsilon }_{0}}r=C\] \[\Rightarrow r=C/4\pi {{\varepsilon }_{0}}=\left( 1\times {{10}^{-6}}\times 9\times {{10}^{9}} \right)\] \[=9\times {{10}^{3}}m=9km\]


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