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JEE Main & Advanced Physics Electrostatics & Capacitance Question Bank Capacitance

  • question_answer
    The capacity of a parallel plate condenser is \[15\mu \,F\], when the distance between its plates is 6 cm. If the distance between the plates is reduced to 2 cm, then the capacity of this parallel plate condenser will be                [AFMC 2000]

    A)            \[15\mu \,F\]                       

    B)            \[30\mu \,F\]

    C)            \[45\mu \,F\]                       

    D)            \[60\mu \,F\]

    Correct Answer: C

    Solution :

               \[C\propto \frac{1}{d}\Rightarrow \]\[\frac{{{C}_{1}}}{{{C}_{2}}}=\frac{{{d}_{2}}}{{{d}_{1}}}\]Þ \[\frac{15}{{{C}_{2}}}=\frac{2}{6}\]Þ C2 = 45mF


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