The emf produced by the motion of a coil across the magnetic field is called:

Explanation

The electromotive force (emf) produced by the motion of a coil across a magnetic field is specifically referred to as Motional emf. Motional emf refers to the electromotive force induced in a conductor or coil when it moves through a magnetic field at a constant velocity. This phenomenon is described by Faraday's law of electromagnetic induction, which states that the rate of change of magnetic flux through a circuit induces an emf in the circuit. When the coil moves through the magnetic field, the magnetic flux linked with the coil changes, resulting in an induced emf.