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10th Class Science Electricity and Circuits Question Bank Electricity

  • question_answer
    In the circuit shown here, the ammeter A reads 5 A and the voltmeter V reads 20 V. The correct value of resistance R is

    A) Exactly \[4\Omega \]

    B) Slightly greater than \[4\Omega \]

    C) Slightly less than \[4\Omega \]

    D) Zero

    Correct Answer: B

    Solution :

    Voltmeter is not ideal so a small amount of current will pass through it. Hence voltage drop across R will 20 V if R is lightly greater than \[4\Omega .\]


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