Answer:
1. Changing the magnetic field intensity
2. Changing the area enclosed by the loop
3. Changing the orientation of the loop of wire with respect to the magnetic field
Explanation:
Electromagnetic induction occurs when there is a variation of magnetic flux through a coil of wire: as a result, an emf (electromotive force) is induced in the coil, according to the equation
[tex]\epsilon=-\frac{\Delta \Phi}{\Delta t}[/tex]
where
[tex]\Delta \Phi[/tex] is the variation of magnetic flux through the coil
[tex]\Delta t[/tex] is the time elapsed
The magnetic flux through a coil of wire is given by:
[tex]\Phi = BA cos \theta[/tex]
where
B is the magnetic field intensity
A is the area enclosed by the coil
[tex]\theta[/tex] is the angle between the direction of B and the perpendicular to the area enclosed by the coil
As we can see, the magnetic flux depends on these three factors, so changing any of them will change the magnetic flux, and an electromotive force will be induced in the coil as a result.
