A moving coil type of galvanometer is based upon the principle that

coil carrying current experiences a torque in magnetic field.

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a coil carrying current produces a magnetic field.

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a coil carrying current experiences impulse in a magnetic field.

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a coil carrying current experiences a force in a magnetic field.

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Solution

The correct option is C coil carrying current experiences a torque in magnetic field.
In a moving coil type of galvanometer needle deflects when torque in magnetic field is non-zero. So, a moving coil galvanometer is based upon the principle that coil carrying current experiences a torque in a magnetic field.

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