Question

Why induced EMF is known as back EMF​

Answer 1

In electromagnetism and electronics, electromotive force, is the electrical action produced by a non-electrical source. Devices provide an emf by converting other forms of energy into electrical energy, such as batteries or generators. Sometimes an analogy to water pressure is used to describe electromotive force.

Answer 2

Induced EMF is also called back EMF because, the induced EMF opposes the change in current, due to the source of EMF. The induced current causes a restoring torque in the coil. An external source is responsible for the supply of energy for this torque. So we can say that source of this power is the external rotor.

Hope this helps!