magnets

Question 1

What is an electromagnet?

Answer 1

It is a temporary magnet made by passing an electric current through a coil of wire wrapped around a magnetic core.

Question 2

What are the four magnetic elements

Answer 2

Iron, cobalt, and nickel. Steel is also magnetic because it is an alloy that contains iron.

Question 3

How can you make an electromagnet stronger?

Answer 3

Increase the number of coils (turns) of wire around the core.
Increase the electric current flowing through the wire (e.g., by adding more batteries).
Add a soft iron core

Question 4

What is the difference between electro and permanent magnets?

Answer 4

Electromagnets can be turned on and off, and their strength can be customised while permanent magnets last forever and have a fixed strength.

Question 5

What are the two types of force that a magnet can produce?

Answer 5

Attraction or repulsion.

Question 6

What are the two poles on a magnet?

Answer 6

North and South.

Question 7

What are the rules with the poles of magnets?

Answer 7

Opposites attract (N & S) and like poles repel (N & N).

Question 8

What way do field lines point?

Answer 8

From the North pole to the South pole.

Question 9

Where are field lines concentrated?

Answer 9

At the poles.

Question 10

Why does the Earth have a magnetic field?

Answer 10

Because the core rotates. It acts like a giant bar magnet.