Pearson Edexcel International GCSE (9–1) · PHYSICS · Section
ELECTRIC MOTORS AND ELECTROMAGNETIC INDUCTION
16 practice questions
Practice questions
1–10 of 16
Question 1
1 mark · Easy
Answer and see the solution →State what is produced around a conductor when an electric current flows through it.
Question 2
3 marks · Easy
Answer and see the solution →The diagram below shows a simple electromagnet made by wrapping wire around an iron nail and connecting the ends to a battery.
(a)[1 mark]Name the core material used in this electromagnet.
(b)[1 mark]State one way, apart from using more batteries, to make this electromagnet stronger.
(c)[1 mark]Explain why a soft iron core is used rather than a steel nail.
Question 3
2 marks · Easy
Answer and see the solution →Draw the pattern of magnetic field lines around a straight conductor (wire) carrying a current. Show the direction of the field using arrows.
Question 4
1 mark · Easy
Answer and check →Which statement about the direction of force on a current-carrying wire in a magnetic field is correct?
- A.It is always parallel to the direction of the current.
- B.It acts at right angles to both the current and the magnetic field.
- C.It is in the direction of the magnetic field.
- D.It always points upwards.
Question 5
1 mark · Easy
Answer and see the solution →State Fleming’s left hand rule for the direction of force on a current-carrying wire in a magnetic field.
Question 6
3 marks · Easy
Answer and see the solution →A student wishes to investigate how the force on a wire in a magnetic field changes when they change the current and the strength of the field.
(a)[2 marks]State two variables the student can change to increase the force acting on the wire.
(b)[1 mark]State one way the student could decrease the force on the wire.
Question 7
3 marks · Easy
Answer and see the solution →A loudspeaker converts electrical energy into sound using the motor effect.
(a)[1 mark]Name the part of the loudspeaker that moves to create sound waves.
(b)[1 mark]State what causes this part to move.
(c)[1 mark]Briefly explain why the motion of this part can change direction.
Question 8
1 mark · Easy
Answer and check →Which one of the following changes would NOT increase the turning force produced by a simple electric motor?
- A.Increase the number of turns of wire in the coil.
- B.Increase the strength of the magnetic field.
- C.Increase the current in the coil.
- D.Use a steel core instead of a soft iron core.
Question 9
1 mark · Normal
Answer and check →Which change will NOT increase the force experienced by a wire carrying a current in a magnetic field?
- A.Increasing the strength of the magnetic field
- B.Increasing the current in the wire
- C.Reversing the direction of the current
- D.Reducing the length of the wire in the field
Question 10
3 marks · Normal
Answer and see the solution →Figure 1 shows a long, straight wire carrying a current. The current flows vertically upwards out of the page.
Figure 1. A long, straight wire with current out of the page. (a)[1 mark]Draw the magnetic field pattern around the wire.
(b)[1 mark]State the rule used to determine the direction of the magnetic field lines.
(c)[1 mark]Explain how the field strength would change if the current is increased.