JEE Main & Advanced Physics Magnetism Question Bank Self Evaluation Test - Magnetism and Matter

  • question_answer
    A tangent galvanometer is connected directly to an ideal battery. If the number of turns in the coil is doubled, the deflection will 

    A) increase

    B) decrease

    C) remain same

    D) any of these

    Correct Answer: C

    Solution :

    [c] \[i=\left( \frac{2R{{B}_{H}}}{{{\mu }_{0}}N} \right)\,\tan \,\theta \] or       \[\frac{V}{R}=\left( \frac{2R{{B}_{H}}}{{{\mu }_{0}}N} \right)\,\tan \theta \]      ?? (i) When number of turns are doubled, resistance of the coil is also doubled, so \[\frac{V}{(2R)}=\left[ \frac{2R{{B}_{H}}}{{{\mu }_{0}}(2N)} \right]\tan \,{{\theta }^{'}}\]       ?? (ii) From (i) and (ii),\[{{\theta }^{'}}=\theta \].


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