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JIPMER Jipmer Medical Solved Paper-1996

  • question_answer
    A galvanometer of 25 ohms and having full scale deflection for a current of 10 mA is changed into voltmeter of range 100 volts by connecting a resistance R in series with the galvanometer. The resistance R in ohms is:

    A)  10000   

    B)                                         975                       

    C)  10025                  

    D)         9975

    Correct Answer: D

    Solution :

    Using formula for resistance R \[R=\frac{V}{{{i}_{g}}}-G\] Here, \[G=25\,\Omega ,\]\[{{i}_{g}}=10\times {{10}^{-3}}A,\]\[V=100\,V\] On putting the value in above formula, we get \[=\frac{100}{10\times {{10}^{-3}}}-25\] \[=1000-25\] \[=9975\,ohm\]


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