GEOLOGY

Detailed explanation-1: -Increase the number of coil turns. Increase the current flowing through the coil. Wrap the coil tightly around the iron piece. Increase the current or voltage.

Detailed explanation-2: -Electromagnets can be created by wrapping a wire around an iron nail and running current through the wire. The electric field in the wire coil creates a magnetic field around the nail. In some cases, the nail will remain magnetised even when removed from within the wire coil.

Detailed explanation-3: -There are two methods by which we can increase strength of magnetic field are: 1) By increasing the number of turns of wire in the coil. 2) By increasing the current flowing the coil.

Detailed explanation-4: -Increasing he strength of the current passing through the coil, the greater the current, the greater the strength; Increasing the number of turns in the coils, the greater the number of turns, the greater the strength; Whether the core is made up of a soft or hard magnetic material.

Detailed explanation-5: -As the soft iron core is a highly ferromagnetic material, It allows (and attracts) the magnetic field lines to pass through it. When such material is used in the electromagnet, the magnetic field lines passing through it increases, thereby, the strength of the electromagnet increases.