CET Karnataka Medical CET - Karnataka Medical Solved Paper-2000

  • question_answer
    The dimension of \[\frac{1}{2}{{\varepsilon }_{0}}{{E}^{2}}\] (\[{{\varepsilon }_{0}}\]is the permittivity of free space, and E is electric field), is:

    A) \[[M{{L}^{2}}{{T}^{-1}}]\]

    B)  \[[M{{L}^{-1}}{{T}^{-2}}]\]

    C)  \[[M{{L}^{2}}{{T}^{-2}}]\]

    D)  \[[ML{{T}^{-1}}]\]

    Correct Answer: B

    Solution :

     The quantity \[\frac{1}{2}{{\varepsilon }_{0}}{{E}^{2}}\]represents energy per unit volume. Thus, it has dimensions of \[\frac{\text{energy}}{\text{volume}}=\frac{[M{{L}^{2}}{{T}^{-2}}]}{[{{L}^{3}}]}=[M{{L}^{-1}}{{T}^{-2}}]\]


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