Magnetism and Electromagnetism

Front

What is magnetism?

Back

Magnetism is a physical phenomenon produced by the motion of electric charge, which results in attractive and repulsive forces between objects.

Front

What is an electromagnet?

Back

An electromagnet is a type of magnet in which the magnetic field is produced by an electric current.

Front

How can the strength of an electromagnet be increased?

Back

The strength of an electromagnet can be increased by increasing the current, using a stronger ferromagnetic core, or winding the coils closer together.

Front

What happens to magnetic field lines around a bar magnet?

Back

Magnetic field lines spread out from one pole of the magnet and curve around to the other pole.

Front

What are the Earth's magnetic poles?

Back

The Earth's magnetic poles are the points on the Earth's surface where the magnetic field is vertical.

Front

What is magnetic declination?

Back

Magnetic declination is the angle between magnetic north (the direction a compass points) and true north (the direction of the geographic North Pole).

Front

What device is used to measure electric current?

Back

A galvanometer is used to measure the current induced when a wire passes through a magnetic field.

Front

What is the role of a ferromagnetic core in an electromagnet?

Back

A ferromagnetic core enhances the magnetic field produced by the electromagnet, making it stronger.

Front

What is the difference between the geographic poles and magnetic poles?

Back

The geographic poles are fixed points on the Earth's surface, while the magnetic poles can change position over time.

Front

What is the relationship between electricity and magnetism?

Back

Electricity and magnetism are interrelated; an electric current produces a magnetic field, and a changing magnetic field can induce an electric current.