Aferromagnet and electromagnet can be used together to
(a) create a strong magnetic field.
(b) create a weak magnetic field.
(c) cancel any external magnetic fields.
(d) create a heavy magnet.

The correct option is : (a) Create a strong magnetic field.

Explanation:

An electromagnet is a substance which produces magnetic field when electric current is passed through it. The magnetic field produced by them disappears when the electric current is turned off.

A Ferromagnetic substance is a substance that gets magnetized when kept in an external magnetic field. Such substances remain magnetized even after the external magnetic field is removed.

When an electromagnet and a ferromagnet is combined, it results in the production of a strong magnetic field.