Physics 2013 JAMB Past Questions - Question 44: Induced emfs are best explained using

Correct Answer

B

Explanation

Michael Faraday did extensive work in electricity such that the industry for generating and distributing electricity on a large scale depends on his pioneering work; and that of Joseph Henry.
Faraday's law of electromagnetic induction. According to this law, when there is a change in the magnetic field through a loop of wire, an electromotive force (emf) is induced in the wire. This emf can be explained by the principle of magnetic flux. Magnetic flux is a measure of the number of magnetic field lines passing through a given area. When the magnetic flux through a loop of wire changes, an emf is induced in the wire, which can cause a current to flow if the circuit is closed. This phenomenon is the basis for many electrical devices, such as generators and transformers.