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Answer: a
Explanation: Pulsational emf is also called the transformer emf. It is produced when the coil is stationary and flux varies with time. Such emf is produced in a transformer and no motion takes place in this machine.
The EMF (ElectroMotive Force) in a transformer is given by the equation derived from Faraday’s Law of Electromagnetic Induction. This equation is:
[ EMF = -N frac{dPhi}{dt} ]
where:
– (EMF) is the electromotive force in volts (V),
– (N) is the number of turns in the coil,
– (frac{dPhi}{dt}) is the rate of change of magnetic flux through one turn of the coil in webers per second (Wb/s).
The equivalent term for transformer EMF in the context of the question might be looking for a specific phrase or term that describes this concept. However, there is no alternative term provided in the question. Therefore, the correct understanding is that the EMF in a transformer is the voltage induced in its coils due to the changing magnetic flux, which adheres to Faraday’s Law of Electromagnetic Induction. In simpler terms, the EMF in a transformer correlates directly with the transformer’s operation principle, which involves inducing a voltage from one coil to another (or more) within the transformer through electromagnetic induction.