A second experiment can be carried out to investigate how the strength of the electromagnet depends on the number of turns in the coil.
As the number of turns increases the number of paper clips held increase.
This means that the strength of the magnet increases with increasing number of turns in the coil.
Once again, since the line of best fit is a straight line through the origin, we can be even more precise.
We can say that, the strength of the electromagnet is directly proportional to the number of turns in the coil.
If you double the number of turns, you double the strength of the electromagnet.
Repeat the experiment once more, keeping the current and number of coils the same.
Replace the iron core with similar lengths of different materials such as steel, wood, plastic, aluminium and air.
Count the number of paper clips held by each material.
Record in a table and compare results.
Iron and steel make strong electromagnets.
The strength of an electromagnet depends on:
The strength of the magnetic field increases as: