Answer:
All the 4 options
Explanation:
Electromagnetic induction occurs when the magnetic flux through a coil of wire is changing over time:
[tex]\epsilon = -\frac{\Delta \Phi}{\Delta t}[/tex]
where
[tex]\epsilon[/tex] is the emf induced in the coil
[tex]\Delta \Phi[/tex] is the variation of magnetic flux
[tex]\Delta t[/tex] is the variation of time
The presence of an emf in the coil will generated an induced current.
The magnetic flux through the coil is given by
[tex]\Phi = BA cos \theta[/tex]
where
B is the intensity of the magnetic field
A is the area of the coil
[tex]\theta[/tex] is the angle between the direction of the field and the axis of the coil
We see that any actions that changes one of these 3 variables will change the magnetic flux through the coil, so it will also induce a current.
The 4 options are:
1.Moving the loop outside of the magnetic field region. --> this will decrease the intensity of the magnetic field, B, therefore it will change the flux, and it will induce a current
2.Spin the loop such that its axis does not consistently line up with the magnetic field direction. --> this will change the angle between the direction of the coil's axis and the field B, so this will also change the flux, and therefore will induce a current
3.Change the magnitude of the magnetic field. --> this will change the magnitude of B, so this will also change the flux, and therefore will induce a current
4.Change the diameter of the loop --> this will change the area of the coil A, so this will also change the flux, and therefore will induce a current
Therefore, all 4 options are correct.
