Answer:
Strength and quantity.
Step-by-step explanation:
Strength and quantity of electromagnetic can be controlled by currents of electricity because it depends on the electric current. Electromagnets is to be controlled by controlling the electric current. If the current is turn on, also turns the magnetic field on while on the other hand, If the current is turn off, also turn off the magnetic field. The quantity of current flowing through the coil can also control the strength of the electromagnetic field around that coil.