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12th Class Physics Magnetism Question Bank MCQ - Moving Charges and Magnetism

  • question_answer
    A volmeter which can measure 2 V is constructed by using a galvanometer of resistance \[12\,\Omega \] and that produces maximum deflection for the current of 2 mA, then the resistance R is:

    A) \[888\,\Omega \]            

    B) \[988\,\Omega \]

    C) \[898\,\Omega \]            

    D) \[999\,\Omega \]

    Correct Answer: B

    Solution :

    (b) \[988\,\Omega \]                         \[R=\frac{V}{{{l}_{g}}}-{{R}_{G}}\] Putting  \[V=2\,V,{{l}_{g}}=2\,MA=2\times {{10}^{-3}}A,{{R}_{G}}=12\,\Omega ,\] \[\therefore R=\frac{2}{2\times {{10}^{-3}}}-12=1000-12=988\,\Omega \]


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