JEE Main & Advanced Physics Electrostatics & Capacitance Question Bank Assertion and Reason

  • question_answer
    Assertion             :       A charged capacitor is disconnected from a battery. Now if its plate are separated farther, the potential energy will fall.             Reason     :   Energy stored in a capacitor is equal to the work done in charging it.

    A)             If both assertion and reason are true and the reason is the correct explanation of the assertion.

    B)             If both assertion and reason are true but reason is not the correct explanation of the assertion.

    C)             If assertion is true but reason is false.

    D)             If the assertion and reason both are false.

    E)                 If assertion is false but reason is true.

    Correct Answer: E

    Solution :

                    Battery is disconnected from the capacitor. So Q = constant. Energy =\[=\frac{{{Q}^{2}}}{2C}=\frac{{{Q}^{2}}d}{2{{\varepsilon }_{0}}A}\] Þ Energy \[\propto d\]


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