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What is the principle of a moving coil g...

What is the principle of a moving coil galvanometer ?

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Moving coil galvanometer is based on the fact that when a current carrying coil is placed in a uniform magnetic field, it experiences a torque.
`therefore` current in the coil (i) `prop` deflecting angle `(theta)`.
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Knowledge Check

  • (A) : Earth's magnetic field does not affect the working of a moving coil galvanometer. (R) : The earth's magnetic field is quite weak as compared to magnetic field produced in the moving coil galvanometer.

    A
    Both 'A' and 'R' are true and 'R' is the correct explanation of 'A'.
    B
    Both 'A' and 'R' are true and 'R' is not the correct explanation of 'A'
    C
    'A' is true and 'R' is false
    D
    'A' is false and 'R' is false

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