Explain why, the core of an electromagnet should be of soft iron and not of steel.
The strength of electromagnet depends on the following factors:
i) Number of turns in the coil: Increasing the number of turns in the coil increase the strength of magnetic field produced by the electromagnet.
ii) Current flowing through the coil: Increasing the current flowing through the coil increases the strength of magnetic field produced.
iii) Length of air gap between its poles: Decreasing he length of air gap between the poles of electromagnet increases the strength of electromagnet.