NEET Sample Paper NEET Sample Test Paper-21

  • question_answer What are the dimensions of electrical resistance?

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

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

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

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

    Correct Answer: B

    Solution :

    From Ohm's law, resistance R is given by \[\text{R}\,\text{=}\,\frac{\text{Potential}\,\text{Difference}}{\text{Current}}\] \[\therefore \] Dimensions of \[R=\frac{M{{L}^{2}}{{T}^{-3}}{{A}^{-1}}}{A}=M{{L}^{2}}{{T}^{-3}}{{A}^{-2}}\] Hence, the correction option is (b).

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