NEET Physics Question - Alternating Current - Average Current and RMS Current

Assertion (A): The moving coil ammeters or voltmeters can't be employed to measure alternating current or voltage respectively.

Reason (R): If an alternating current is passed through a moving coil ammeter or voltmeter, then the average value of torque experienced by the coil is zero.

Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Solution:

Moving coil instruments measure the average value of current. For AC, the average value over a full cycle is zero, resulting in zero average torque. Hence, moving coil ammeters/voltmeters cannot measure AC. Both assertion and reason are true, and the reason correctly explains the assertion.

Rankers Physics

Moving Coil Ammeter/Voltmeter

Solution:

Leave a Reply Cancel reply