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Chhattisgarh PMT Chhattisgarh PMT Solved Paper-2006

  • question_answer
    There is a voltmeter in a circuit. In order to triple its range, the resistance of how much value should be used?

    A)  2R                                         

    B)  R/2

    C)  3R                                         

    D)  4R

    Correct Answer: A

    Solution :

    If R is the resistance of the voltmeter and current is flowing through it, then \[V=IR\]                 or            \[R=\frac{V}{I}\] If now resistance connected in series is R', the                 \[R+R'=\frac{3V}{I}\]                 \[R+R'=3R\]                 \[R'=2R\]


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