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

  • question_answer
    A galvanometer of resistance \[40\,\Omega \] gives a deflection of 5 divisions per mA. There are 50 divisions on the scale. The maximum current that can pass through it when a shunt resistance of \[2\,\Omega \]. is connected is:

    A) 210 mA           

    B) 155 mA                

    C) 420 mA            

    D) 75 mA                 

    Correct Answer: A

    Solution :

    (a) 210 mA             \[{{l}_{g}}=\frac{50}{5}=10\,mA;\,{{R}_{G}}=40\,\Omega ,\,{{r}_{s}}=2\,\Omega \] Maximum current, \[l=\frac{{{R}_{G}}+{{r}_{S}}}{{{r}_{s}}.}\times {{l}_{g}}=\frac{(40+2)\times 10}{2}=210\,mA\]


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