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MGIMS WARDHA MGIMS WARDHA Solved Paper-2007

  • question_answer
    A candidate connects a moving coil ammeter A and a moving coil voltmeter V and a resistance R as shown. If the voltmeter reads 20 V and the ammeter reads 4 A, then R is

    A) equal to 5\[\Omega \]                  

    B) greater than 5\[\Omega \]

    C) less than 5\[\Omega \]                 

    D) none of these

    Correct Answer: B

    Solution :

    Here,\[I=4\text{ }A,\text{ }V=20\]volt, so \[R=\frac{V}{I}=\frac{20}{4}=5\Omega \]Since, voltmeter is connected in parallel with resistance R, the effective resistance of this combination is\[5\Omega \]only, the resistance R is greater than\[5\Omega \]because total resistance in parallel combination becomes less than individual resistance.


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