The strength of an electromagnet increases with an increase in the number of turns of the coil.
An electromagnet is a type of magnet that is created by passing an electric current through a coil of wire. The magnetic field produced by the current in the coil causes the coil to act as a magnet, which can attract or repel other magnetic materials.
The strength of an electromagnet depends on several factors, including the number of turns of wire in the coil, the amount of current passing through the wire, and the shape and material of the core used in the coil.
In particular, increasing the number of turns of wire in the coil increases the strength of the magnetic field produced by the current. This is because each turn of wire adds to the magnetic field produced by the other turns, resulting in a stronger overall magnetic field.
Decreasing the current in the coil or increasing the distance between the poles of the magnet will decrease its strength. Increasing the current without the coil will not result in the creation of an electromagnet because a magnetic field is produced by the flow of current through a coil of wire, not by the current itself.