Move the magnet at a relatively constant frequency back and forth through the coil. The voltage displayed is proportional to the current flowing in the coil. What happens as you move the magnet through the coils with different number of loops?

The induced EMF, and hence the induced current produced will increase or decrease with the number of loops on the coil.

Explanation:

According to Faraday' law of electromagnetic induction, the induced EMF increases with the speed with which we turn the coil, the surface area of the coil, the number of loops, and the strength of the magnetic field. From this, we can see that increasing the number of loops also increases the surface area involved. This means that if we move the magnet in this experiment through the coils with different number of loops, the induced EMF, and hence the induced current, will increase or decrease with an increase or decrease in the number of loops respectively.