What is the main reason for getting an emf while doing this process?�

1.	What is the main reason for getting an emf while doing this process?
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.

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

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