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When the coil in an electric machine is stationary and the magnetic flux varies with time, the kind of electromotive force (emf) produced is called dynamically induced emf. This type of emf arises due to the principle of electromagnetic induction, as described by Faraday’s law. Specifically, when the magnetic flux through a stationary coil changes over time, a voltage is induced across the coil. This process does not require the coil to physically move through the magnetic field; instead, the variation in magnetic flux with time is the key factor that generates the emf.
Answer: a
Explanation: Transformer emf also called the pulsational emf is produced when the coil is stationary and flux varies with time. No energy conversion takes place in this process. This kind of emf is generated in a transformer.