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  4. The reason a moving coil galvanometer cannot be used with an alternating current is that

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Q. The reason a moving coil galvanometer cannot be used with an alternating current is that

NTA AbhyasNTA Abhyas 2020

Solution:

The typical coil galvanometer is based on the principle that, when a current carrying coil is placed in a magnetic field, the coil experiences a torque.
Since, the current in an AC averages out to zero, the net magnetic field produced will be zero. Hence, the average torque experienced in a given time interval would be zero. Therefore, there will be no deflection.