Answer:
changes
Explanation:
According to Michael Faraday, voltage is induced on a metallic conductor when the magnetic field changes. The principle is known as the principle of electromagnetic induction. The voltage induced on the metallic conductor is referred to as induced emf.
The magnitude if induced emf depends on the rate of change of the magnetic flux.
In the case when the Voltage will be induced in a wire loop at the time when the magnetic field within that loop so it changes.
As per Michael Faraday, voltage should be induced at the time when the magnetic field changes with respect to the metallic conductor. This process we known as the electromagnetic induction.
Also, the induction of the voltage based on the metallic conductor should be called as the induced emf.
Therefore, the correct option is b.
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