JEE Main & Advanced Physics Magnetic Effects of Current / करंट का चुंबकीय प्रभाव Question Bank Self Evaluation Test - Moving Charges and Mangetism

  • question_answer
    A micrometer has a resistance of\[100\Omega \] and full scale range of\[50\mu A\]. It can be used as a voltmeter or as a higher range ammeter provided a resistance is added to it. Pick the correct range and resistance combination 

    A) 50 V range with\[10k\Omega \] resistance in series

    B) 10 V range with\[200k\Omega \] resistance in series

    C) 10 mA range with\[1\Omega \] resistance in parallel

    D) 10 mA range with \[0.1\Omega \] resistance in parallel

    Correct Answer: B

    Solution :

    [b] \[{{i}_{g}}=i\left( \frac{SG}{S+G} \right)\] or  \[50\times {{10}^{-6}}=i\left( \frac{S}{S+100} \right)\]              ....... (i) Also   \[V={{i}_{g}}\left( G+{{R}_{0}} \right)\]  or   \[V=50\times {{10}^{-6}}(100+{{R}_{0}})\]                  ?.. (ii) On simplifying above equations, we get \[V=10V\], \[{{R}_{0}}=200\times {{10}^{-3}}\Omega \]


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