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What is current sensitivity of galvanome...

What is current sensitivity of galvanometer ? How it can be increase ?

Text Solution

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1. For galvanometer,
`kphi=NIAB`
`thereforephi/I=(NAB)/k`
Current sensitivity of galvanometer `(phi/I)`, is deflection per unit current.
2. To increase the sensitivity is to increase the number of turns N.
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Knowledge Check

  • ______ is known as current sensitivity of a galvanometer.

    A
    Current per unit angular deflection
    B
    Angular deflection per unit current
    C
    current for maximum deflection
    D
    None of above

  • Current sensivity of galvanometer in inversely proportional to……

    A
    number of turns
    B
    torsional constant
    C
    area
    D
    magnetic field

  • Current sensitivity of a moving coil galvanometer is 5 div/mA and its voltage sensitivity (angular deflection per unit voltage applied) is 20 div/V. The resistance of the galvanometer is

    A
    `500Omega`
    B
    `40Omega`
    C
    `250Omega`
    D
    `25Omega`

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    Current sensitivity of galvanometer is inversely proportional to ….. .

    Current sensitivity of galvanometer is inversely proportional to ______ .

    ______ is known as voltage sensitivity of galvanometer.

    In order to increase the sensitivity of a moving coil galvanometer, ______ should be decreased.

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