Electromagnetism - Topic 4 Lessons 3 & 4 (p. 78-95)

Front

What is an electromagnet?

Back

An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. It consists of a coil of wire wrapped around a core, usually made of iron.

Front

What materials are needed to create an electromagnet?

Back

To create an electromagnet, you need an electric current, a wire, and an iron core.

Front

How does moving a magnet near a coil of wire induce an electric current?

Back

Moving a magnet near a coil of wire changes the magnetic field around the wire, which induces an electric current in the wire.

Front

What is the relationship between electric current and magnetic fields?

Back

Electric current traveling in a wire creates magnetic fields that are perpendicular to the direction of the current.

Front

What happens to the ability of a magnet to attract metal objects as its magnetic field strength increases?

Back

As the strength of a magnetic field increases, the ability to attract metal objects increases.

Front

What type of energy is produced when electricity flows through a motor?

Back

When electricity flows through a motor, it is converted into kinetic energy, which causes the motor to spin.

Front

What is the role of the iron core in an electromagnet?

Back

The iron core enhances the magnetic field created by the electric current in the wire, making the electromagnet stronger.

Front

What is a magnetic field?

Back

A magnetic field is an invisible field around a magnet where magnetic forces can be observed, affecting other magnets and magnetic materials.

Front

What is the difference between a permanent magnet and an electromagnet?

Back

A permanent magnet produces a constant magnetic field without the need for electricity, while an electromagnet's magnetic field can be turned on or off and varies with the electric current.

Front

How can you increase the strength of an electromagnet?

Back

You can increase the strength of an electromagnet by increasing the electric current, adding more coils of wire, or using a better core material.