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CMC Medical CMC-Medical Ludhiana Solved Paper-2015

  • question_answer
    By connecting a resistance of 1980\[\Omega \] in series with a voltmeter scale division becomes 100 times larger. The resistance of voltmeter is

    A)  20\[\Omega \]                

    B)  22\[\Omega \]

    C)  25\[\Omega \]                

    D)  28\[\Omega \]

    Correct Answer: A

    Solution :

                    Suppose the resistance of voltmeter is R. If the number of divisions on voltmeter scale is N. Then       \[\frac{IR}{N}=V\]                          ?(i) where, \[I=\]current When resistance of 1980\[\Omega \]is connected, then \[\frac{I\,(R+1980)}{N}=100\,V\]              ?(ii) On dividing Eq.(ii) by Eq. (i), we get \[R+1980=100\,R\] \[\Rightarrow \]               \[R=\frac{1980}{99}\simeq 20\,\Omega \]


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