What is the opposition to the flow of ac produced by a magnetic field with generated back voltage (emf) called?

Answer and Explanation :

The opposition of the flow of alternating current produced by a magnetic field is called inductive reactance it is denoted by , The value of the inductive reactance depends on the value of inductance. The good thing about inductive reactance is that it is not responsible for the power loss as  resistance is responsible for the power loss  

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explanation:

the device is called “ rocket engine”