Question

List two ways of increasing the strength of an electromagnet if the material of the electromagnet is fixed.

Answer 1

Electromagnet

1. When an electric current is used to induce a magnetic field, hence showing magnetic properties it is called an electromagnet.
2. There are generally made up of a metallic core wounded by conducting wires.
3. The current flowing through this wire generates the magnetic field.
4. Due to the magnetic flux generated by this magnetic field, the metallic core acts as a magnet.
5. The magnetic field disappears when the current flow is stopped.
6. Therefore, the metallic core loses its magnetic properties and is called a temporary magnet.

Strength of electromagnet

1. The strength of an electromagnet can be increased by increasing the current flowing through the wounded wire.
2. The strength can also be increased by increasing the number of turns.
3. If $N$ is the total number of turns and $I$ is the current passing through the wire, then the magnetic field is given as,

$B={\mu }_{0}NI$

Where ${\mu }_0$ is the permeability of free space,