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17 March, 15:37

A capacitor is storing energy of 3 Joules with a voltage of 50 volts across its terminals. A second identical capacitor of the same value is storing energy of 1 Joule. What is the voltage across the terminals of the second capacitor?

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  1. 17 March, 15:51
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    28.87 volt

    Explanation:

    Let the capacitance of the capacitor is C.

    Energy, U = 3 J, V = 50 volt

    U = 1/2 C V^2

    3 = 0.5 x C x 50 x 50

    C = 2.4 x 10^-3 F

    Now U' = 1 J

    U' = 1/2 C x V'^2

    1 = 0.5 x 2.4 x 10^-3 x V'^2

    V' = 28.87 volt
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