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A d.c. supply of 120 V is connected to a...

A d.c. supply of 120 V is connected to a large resistance X. A voltmeter of resistance `10 k Omega` placed in series in the ciruuit reads 4 V. What is the value of X?

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Knowledge Check

  • A potentiometer wire of length 1 m has a resistance of 100 Omega. It is connected in series with a resistance and a battery of emf 2 V and of negligible resistance. A source of emf 10 mV is balanced against a length of 40 cm of the potentiometer wire. What is the value of external resistance ?

    A
    `790 Omega`
    B
    `1580 Omega`
    C
    `690 Omega`
    D
    `1280 Omega`

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