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Punjab Medical Punjab - MET Solved Paper-2005

  • question_answer
    An air parallel plate capactior has capacity\[C\]. When capacity and distance between plates are doubled when immersed in a liquid then dielectric constant of the liquid is

    A)  1                                            

    B)  2

    C)  3                                            

    D)  4

    Correct Answer: D

    Solution :

    Capacity of air parallel plate capacitor                 \[C=\frac{A\,\,{{\varepsilon }_{0}}}{d}\] Capacity of parallel plate capacitor when immersed in liquid and distance is doubled, is                 \[C=\frac{KA\,\,{{\varepsilon }_{0}}}{2d}\] or            \[2C=\frac{K}{2}C\]                         \[\left( \because \,\,C=\frac{A{{e}_{0}}}{d} \right)\] or            \[K=4\]


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