A magnet moves inside a coil. Consider the following factors: Which can affect the emf induced in the coil?
A) I only
B) II only
C) III only
D) I and II only
E) I, II, III

Question

A magnet moves inside a coil. Consider the following factors:  Which can affect the emf induced in the coil?
A) I only 
B) II only 
C) III only 
D) I and II only 
E) I, II, III

Quizplus · Accepted Answer

All three factors can affect the emf induced in the coil. 
I) The magnetic field strength will affect the emf induced in the coil because the strength of the field determines how many magnetic field lines pass through the coil, which in turn affects the rate of change of magnetic flux.
II) The speed of the magnet will affect the emf induced in the coil because the faster the magnet moves, the greater the rate of change of magnetic flux and thus the greater the emf induced in the coil.
III) The number of turns in the coil will affect the emf induced in the coil because the more turns there are, the higher the magnetic field strength and the greater the emf induced in the coil.

A Magnet Moves Inside a Coil