Question

why is it said that inductors can be used only in ac circuits ​

Answer 1

Answer:

According to Lenz law the emf opposes the change in the current.

Answer 2

Answer:

According to the lenz's law, this emf opposses the change in the current. Therefore, the applied voltage has overcome this back emf only, because there is no resistance in the circuit..... The AC circuit behaviour with inductor is entirely different from the DC circuit....

Hope it's helpful for you dear.... ☺️