JEE Main & Advanced Physics Electrostatics & Capacitance JEE PYQ-Electrostatics and Capacitance

  • question_answer
    A parallel plate ' condenser with a dielectric of dielectric constant K between the plates has a capacity C and is charged to a potential V volts. The dielectric slab is slowly removed from between the plates and then reinserted. The net work done by the system in this process is   [AIEEE 2007]

    A) \[{{y}^{2}}=x\]

    B) \[y=|\text{ }x|\]

    C) \[\frac{2}{3}\]

    D) zero

    Correct Answer: D

    Solution :

    [d] On introduction and removal and again on introduction, the capacity and potential remain same. So, net work done by the system in this process
    \[x=(2\times {{10}^{-2}})\cos \pi t\]


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