Why does the number of coils, the current and the ype of core affect the strength of the electromagnet

Explanation:

The magnetic field due to the current carrying coil is given by

Where, n be the number of turns, I be the current and is the absolute permeability.

Here, we observe that the strength of electromagnet is proportional to n,  I and .

So, as the number of turns increases or the current increases, the strength of electromagnet increases.

If the core is filled with any other material then relative permeability is also added. So, the nature of core also affects the strength of electromagnet.