P4.1 Magnets and Magnetic Fields

Question 1

At which part of a magnet are the magnetic forces strongest?

Answer 1

The poles of the magnet.

Question 2

What happens when two magnets are brought close together?

Answer 2

They exert a force on each other.

Question 3

What type of force is exerted if two like poles of a magnet are brought near each other?

Answer 3

Repulsion

Question 4

What type of force is exerted if two unlike poles are brought near each other?

Answer 4

attraction

Question 5

What is a permanent magnet?

Answer 5

A material that produces its own magnetic field.

Question 6

What is an induced magnet?

Answer 6

An induced magnet becomes magnetic when placed in a magnetic field.

Question 7

What type of force does induced magnetism always cause?

Answer 7

A force of attraction

Question 8

What happens when an induced magnet is removed from a magnetic field?

Answer 8

The induced magnet loses most/all of its magnetism.

Question 9

What is a magnetic field?

Answer 9

The region surrounding a magnet where another magnet or magnetic where another magnet or magnetic material experiences a non-contact force

Question 10

Give four examples of magnetic materials

Answer 10

• Iron
• Steel
• Copper
• Nickel

Question 11

What can always be said about the force between a magnet and a magnetic material?

Answer 11

It is always attractive

Question 12

How does the strength of a magnetic field alter as you move further away from the magnet producing it?

Answer 12

The magnetic field strength decreases the further you move away.

Question 13

In which direction does a magnetic field point?

Answer 13

• In the direction that a north pole would experience a force if placed in the field
• From the north seeking pole to the south seeking pole of a magnet

Question 14

What does a magnetic compass contain?

Answer 14

A small bar magnet that points in the direction of the Earth’s magnetic field

Question 15

What is produced when a current flows through a coducting wire?

Answer 15

magnetic field

Question 16

Describe the magnetic field produced around a current carrying wire.

Answer 16

Uniform concentric rings around the whole length of the wire.

Question 17

What determines the strength of the magnetic field arond a current-carrying wire?

Answer 17

• The magnitude of the current flowing through the wire.

- The distance from the wire

Question 18

What is a solenoid?

Answer 18

A coil of wire which when current passes through creates a strong magnetic field which can be toggled on and off.

Question 19

Describe the magnetic field found inside a solenoid.

Answer 19

Strong and uniform

Question 20

What does a magnetic compass provide evidence of?

Answer 20

The Earth’s core being magnetic.