Strength of Electromagnet increases when either the "Current" or "Number of turns in a coil" increases.
They are directly proportional to strength of Electromagnet.
Explanation:
To compile, the power or intensity of a coils magnetic field depends on the following circumstances. The number of turns of wire within the coil. The amount of current running in the coil. An electromagnet is a temporary magnet; the magnetic field only survives when an electric current is running through it. The power of the electromagnet depends on how many coils you wind around and how great the voltage is.
