Combined Physics - P7 Magnetism and Electromagnetism

Question 1

Name the three magnetic materials.

Answer 1

• Iron
• Cobalt
• Nickel

Question 2

What happens when two ‘like’ poles are brought together?

Answer 2

They repel each other

Question 3

Is magnetism an example of a contact or non-contact force?

Answer 3

Non-contact force

Question 4

What do you call a material that becomes magnetic when it is placed in the magnetic field of another magnet?

Answer 4

Induced magnet

Question 5

Draw the magnetic field lines around a bar magnet.

Answer 5

Question 6

What happens when two opposite poles are brought together?

Answer 6

They attract each other

Question 7

Complete the diagram to show the directions that the plotting compasses will point.

Answer 7

Question 8

Draw the magnetic field around an electromagnet.

Answer 8

Question 9

What happens when a current flows through a wire?

Answer 9

A magnetic field is produced

Question 10

Describe the magnetic field lines in the middle of an electromagnet.

Answer 10

Strong and uniform

Question 11

Give three ways in which you can increase the strength of an electromagnet.

Answer 11

• Increase the voltage
• Increase the number of coils on the wire
• Use a soft iron core in the middle

Question 12

Higher Q. In Fleming’s left-hand rule, what do the following represent?

a) First finger
b) Second finger
c) Thumb

Answer 12

a) Field (North to south)
b) Current (positive to negative)
c) Movement

Question 13

What is a coil of wire called?

Answer 13

A Solenoid

Question 14

Give two advantages of an electromagnet over a permanent magnet?

Answer 14

• You can turn an electromagnet on and off.
• You can change the strength of the electromagnet

Question 15

What causes the Earth to have a magnetic field?

Answer 15

Liquid iron in the Earth’s core

Question 16

Higher Q. What is the motor effect?

Answer 16

A conductor carrying a current placed in a magnetic field causes the magnet and the conductor to exert a force on one another.