Electro Magnetic Induction And Alternating Currents Question 79

Question: Alternating current can not be measured by dc ammeter because [AIEEE 2004]

Options:

A) ac cannot pass through dc ammeter

B) Average value of complete cycle is zero

C) ac is virtual

D) ac changes its direction

Show Answer

Answer:

Correct Answer: B

Solution:

In dc ammeter, a coil is free to rotate in the magnetic field of a fixed magnet. If an alternating current is passed through such a coil, the torque will reverse it’s direction each time the current changes direction and the average value of the torque will be zero.



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