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

  • question_answer
    If the galvanometer current is 10 mA, resistance of the galvanometer is \[40\,\Omega \], and shunt of \[2\,\Omega \] is connected to the galvanometer, the maximum current which can be measured by this ammeter is:                      

    A) 0.21 A                          

    B) 2.1 A     

    C) 210 A                           

    D) 21 A           

    Correct Answer: A

    Solution :

    (a) 0.21 A,                         \[l=\left( \frac{{{r}_{s}}+{{R}_{G}}}{{{r}_{s}}} \right){{l}_{g}}=\left( \frac{2+40}{2} \right)\times 0.01=0.21\,A\]


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