Physics 2017 JAMB Past Questions - Question 39: A magnet is moved through a coil of wire . The e.m.f. produced in the wire depends on

Correct Answer

D

Explanation

The e.m.f. produced in the wire when a magnet is moved through a coil depends on several factors. These factors include:

1. The strength of the magnetic field: The stronger the magnetic field, the greater the induced e.m.f. in the coil.

2. The speed of the magnet: The faster the magnet moves through the coil, the greater the induced e.m.f. This is because a higher speed results in a larger change in magnetic flux, which induces a larger e.m.f.

3. The number of turns in the coil: Increasing the number of turns in the coil increases the induced e.m.f. This is because each turn of the coil contributes to the total induced e.m.f.

4. The orientation of the magnet and the coil: The induced e.m.f. depends on the relative orientation of the magnet and the coil. For example, if the magnet is moved parallel to the coil, no e.m.f. will be induced. However, if the magnet is moved perpendicular to the coil, the maximum e.m.f. will be induced.

These factors collectively determine the magnitude of the induced e.m.f. in the wire when a magnet is moved through a coil.