JCECE Medical JCECE Medical Solved Paper-2004

  • question_answer A parallel plate capacitor is immersed in an oil of dielectric constant 2. The field between the plates is:

    A)  decreased, by a factor of\[\frac{1}{\sqrt{2}}\]

    B)  increased, by a factor of \[\sqrt{2}\]

    C)  increased, by a factor of\[\frac{1}{2}\]

    D)  decreased, by a factor of 2

    Correct Answer: D

    Solution :

     When a dielectric material is inserted between the plates of a capacitor (keeping the charge to be constant) or capacitor is immersed in dielectric medium, the electric field decreases  by a factor k (the dielectric constant of the dielectric) \[\therefore \] \[E=\frac{{{E}_{0}}}{k}\] Given, \[k=2\] Hence, \[E=\frac{{{E}_{0}}}{2}\] Thus, electric field between the plates is decreased by a factor of 2.

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