Question

what is the main reason for getting an emf while doing this process?​

Answer 1

Answer:

The emf is due solely to the chemistry in the battery that causes charge separation, which in turn creates an electrical voltage that drives the current. For a circuit consisting of an electrical generator that drives current through a resistor, the emf is due solely to a time-varying magnetic field within the generator that generates an electrical voltage that in turn drives the current.