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MGIMS WARDHA MGIMS WARDHA Solved Paper-2005

  • question_answer
    A galvanometer has resistance of 400\[\Omega \]and deflects full scale for current of 0.2 mA through it. The shunt resistance required to covert it into 3A ammeter is :

    A)  0.027\[\Omega \]                          

    B) 0.054\[\Omega \]

    C) 0.0135\[\Omega \]                         

    D) none of these

    Correct Answer: A

    Solution :

    Resistance of galvanometer full scale current \[G=400\,\,\Omega ,\,{{I}_{g}}=0.2\,mA\] \[=0.0002\text{ }A\] \[I=3A\] Required resistance\[S=\frac{{{I}_{g}}C}{I-{{I}_{g}}}\]                                 \[=\frac{0.0002\times 400}{3-0.0002}\]                                 \[=0.027\,\Omega \]     


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