Question

Why does the strength of electromagnet increase with increasing number of coils

Answer 1

Answer:

Putting a piece of iron or steel inside the coil makes the magnet strong enough to attract objects. The strength of an electromagnet can be increased by increasing the number of loops of wire around the iron core and by increasing the current or voltage.

Answer 2

Answer: Increasing the number of coils adds more magnetic field lines, making the electromagnet stronger. This is the magnetic field around a single loop of wire; there are more field lines a single loop than in a straight piece of wire. 

Explanation: