Permanent and Induced Magnets

Question 1

Name three magnetic materials

Answer 1

Any three from: iron, steel, nickel and cobalt

Question 2

What happens to a magnetic material if it is placed in a magnetic field?

Answer 2

It becomes an induced magnet

Question 3

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

Answer 3

Permanent magnets produce their own magnetic field. Induced magnets only have a magnetic field when they are put in another magnetic field.

Question 4

Give one use of a permanent magnet

Answer 4

Magnetic strips in fridge doors, compass pointers

Question 5

Give one use of an induced magnet

Answer 5

Electromagnets, cranes, doorbells

Question 6

What happens to the magnetic field of an induced magnet when it moved far away from a permanent magnet?

Answer 6

The induced magnet’s magnetic field stops being produced

Question 7

Explain why the force between a permanent magnet and an induced magnet is always attractive.

Answer 7

When a permanent magnet is brought near to a magnetic material, the south pole of the permanent magnet induces a north pole in the material (or vice versa) to create the induced magnet. Opposite poles attract, and so the force is always attractive