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

  • question_answer
    In an ammeter, 10% of main current is passing through the galvanometer. If the resistance of the galvanometer is G, then the shunt resistance will be:

    A) 9 G                              

    B) G/9     

    C) 90 G                            

    D) G/90

    Correct Answer: B

    Solution :

    (b) G/9. Given,             \[{{l}_{g}}=0.1l,{{R}_{G}}=G\] Shunt Resistance. \[{{r}_{s}}=\frac{{{l}_{g}}{{R}_{G}}}{l-{{l}_{g}}}=\frac{(0.1l)G}{l-0.1l}=\frac{0.1/G}{0.9l}=\frac{G}{9}\]


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