Magnetism and Electromagnestism

Question 1

Magnet

Answer 1

an object capable of exerting a magnetic force

Question 2

Are magnetic forces contact or non-contact ?

Answer 2

Magnetic forces are non-contact forces - this means that magnets affect each other without touching.

Question 3

Name the two poles of magnets

Answer 3

• north pole

- south pole

Question 4

Attraction of Poles

Answer 4

like poles (N-N or S-S) repel
unlike poles (N-S or S-N) attract

Question 5

Name two magnetic materials ….

Answer 5

Iron, steel, nickel and cobalt are magnetic materials.

Question 6

Key features of a permanent magnet:

Answer 6

it produces its own magnetic field

the magnetic field cannot be turned on and off - it is there all the time

Question 7

Key features of induced magnets:

Answer 7

they are only attracted by other magnets, they are not repelled
they lose most or all of their magnetism when they are removed from the magnetic field

Question 8

What is the main difference between a induce and permanent magnet ?

Answer 8

Unlike a permanent magnet, an induced magnet only becomes a magnet when it is placed in a magnetic field.

Question 9

How to test for a permanent magnet ?

Answer 9

A permanent magnet can:

attract or repel another permanent magnet
attract a magnetic material (but not repel it)