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NEET Sample Paper NEET Sample Test Paper-17

  • question_answer
    A parallel plate condenser with a dielectric of constant K between the plates has a capacity C and is charged to a potential V volt. The dielectric slab is slowly removed from between the plates and then reinserted. The network done by the system is this process is:

    A) 0

    B) \[\frac{1}{2}(K-1)C{{V}^{2}}\]                 

    C)  \[\frac{C{{V}^{2}}(K-1)}{K}\]                 

    D) \[(K-1)C{{V}^{2}}\]  

    Correct Answer: A

    Solution :

    As the initial and final states of the system are identical, so there is no change in the energy of the system \[\therefore \] Net work done by the system \[={{U}_{f}}-{{U}_{i}}=0.\] Hence, the correction option is [a].


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