Magnetism, electromagnets, and motors

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 a permanent magnet?

Back

A permanent magnet is a magnet that can not be turned off and maintains its magnetic properties without the need for an external power source.

Front

What happens when a north pole and a south pole of magnets are brought together?

Back

They will attract each other.

Front

What is the magnetic field?

Back

The magnetic field is the region around a magnet where magnetic forces can be detected.

Front

What is the difference between attraction and repulsion in magnets?

Back

Attraction occurs when opposite poles (north and south) come together, while repulsion occurs when like poles (north-north or south-south) are near each other.

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 electric current, adding more coils of wire, or using a ferromagnetic core.

Front

What is the role of a commutator in a motor?

Back

A commutator reverses the direction of current in the motor windings, allowing the motor to continue spinning in one direction.

Front

What is the principle of electromagnetic induction?

Back

Electromagnetic induction is the process by which a changing magnetic field can induce an electric current in a conductor.

Front

What is the function of a magnetic switch?

Back

A magnetic switch uses a magnetic field to open or close an electrical circuit.