Permanent and Induced Magnetism, and Magnetic Forces and Fields - Paper 2

Question 1

What happens when two magnets are brought close to each other?

Answer 1

They exert a force on each other. Two like poles repel each other. Two unlike poles attract each other.

Question 2

Describe induced magnetism

Answer 2

An induced magnet is a material that becomes a magnet when it is placed in a magnetic field. Induced magnetism always causes a force of attraction. When removed from the magnetic field an induced magnet loses most/all of its magnetism quickly.

Question 3

Define magnetic field

Answer 3

The region around a magnet where a force acts on another magnet or on a magnetic material is called the magnetic field.

Question 4

How do magnets act on magnetic material?

Answer 4

The force between a magnet and a magnetic material is always one of attraction.

Question 5

How does the strength of a magnetic field vary?

Answer 5

The strength of the magnetic field depends on the distance from the
magnet. The field is strongest at the poles of the magnet.

Question 6

Describe the direction of a magnetic field

Answer 6

The direction of the magnetic field at any point is given by the direction of the force that would act on another north pole placed at that point.
The direction of a magnetic field line is from the north (seeking) pole of a magnet to the south (seeking) pole of the magnet.

Question 7

How does a magnetic compass work?

Answer 7

A magnetic compass contains a small bar magnet. The compass needle points in the direction of the Earth’s magnetic field.