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12th Class Physics Magnetism Question Bank Case Based (MCQs) - Moving Charges and Magnetism

  • question_answer
    To increase the current sensitivity of a moving coil galvanometer, we should decrease:

    A) (a) strength of magnet  

    B)             (b) torsional constant of spring

    C)             number of turns in coil

    D)             area of coil

    Correct Answer: B

    Solution :

    (b) torsional constant of spring Current sensitivity of galvanometer             \[\frac{\phi }{l}={{S}_{i}}=\frac{NBA}{k}\] Hence, to increase (current sensitivity) \[{{S}_{p}}\] (torsional constant of spring) k must be decreased.


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