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Galvanometer shows deflection when curre...

Galvanometer shows deflection when current passes through it. This is because,

A

it is based on heating effect of current

B

it is based on magnetic effect of current

C

it is based on induced emf

D

it is based on electrolysis

Text Solution

Verified by Experts

The correct Answer is:
B
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A galvanometer with a coil resistance of 100Omega shows a full-scale deflection when a current of 1 mA is passed through it. What is value of the resistance which can convert this galvanometer into an ammeter showing a full scale deflection for a current 10 A? A resistance of the required value is available but it will get burnt if the energy dissipated in it is greater then 1 W. Can it be used for the conversion of the galvanometer described above?

A galvanometer with a coil resistance of 100Omega shows a full-scale deflection when a current of 1 mA is passed through it. What is the value of the resistance which can convert this galvanometer into an ammeter showing a full-scale deflection for a current of 10A? A resistance of the required value is available but it will get burnt if the energy dissipated in it is greater than 1W. Can it be used for the conversion of the galvanometer described above? [Hint:Power dissipated = I^(2) watt)

Knowledge Check

  • A galvanometer gives full scale deflection when the current passed through it is 3 mA. Its resistance is 100 Omega with connecting additional resistance in series, then it can be used as voltmeter of range

    A
    3.0 V
    B
    0.3 V
    C
    0.020 V
    D
    0.003 V

  • A galvanometer having a coil resistance 200 Omega gives a full scale deflection when a current of 1mA is passed through it. What is the value of the resistance which can convert this galvanometer into a voltmeter giving full scale deflection for a potential difference of 50 V?

    A
    `19.9 k Omega`
    B
    `48.9 k Omega`
    C
    `49.8 k Omega`
    D
    `10 k Omega`

  • A galvanometer with a coil of resistance 50 Omega shows full-scale deflection when 10 mA current passes through it.

    A
    The galvanometer can measure a maximum voltage of 0.5 V.
    B
    5 A current can be measured if a shunt of `0.1 Omega` is connected in parallel to it.
    C
    It can be used as voltmeter to measure a voltage of 5 V if `450 Omega` resistance is connected in series with the coil of the galvanometer.
    D
    It can be used as a voltmeter to measure a voltage of 50 V if `4,950 Omega` resistance is connected in series with the coil of the galvanometer.

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