Pearson Edexcel International GCSE (9–1) · PHYSICS · Section
ELECTROMAGNETIC INDUCTION
15 practice questions
Practice questions
1–7 of 7 · Normal
Question 1
4 marks · Normal
Answer and see the solution →A straight wire is moved quickly at right angles through the magnetic field between the poles of two magnets, as shown below.
A wire AB moving at right angles across a uniform magnetic field between north and south poles. (a)[1 mark]State the name of the process by which a voltage is produced in the wire.
(b)[2 marks]Explain how the movement of the wire causes a voltage to be induced in it.
(c)[1 mark]Give one way, other than moving the wire faster, to increase the size of the induced voltage.
Question 2
3 marks · Normal
Answer and see the solution →Generators are used in power stations to produce electricity for homes and businesses.
Explain, in terms of electromagnetic induction, how a generator can produce electricity. Include what needs to move and why this movement is necessary.
Question 3
1 mark · Normal
Answer and check →Which of the following will NOT increase the size of the voltage induced in a wire by electromagnetic induction?
- A.Using a stronger magnet
- B.Moving the wire faster across the magnetic field
- C.Increasing the number of turns in the coil
- D.Using a weaker magnet
Question 4
3 marks · Normal
Answer and see the solution →A student investigates how the induced voltage in a coil changes with the speed of a moving magnet. Her results are shown in the table.
Induced voltage vs. speed of magnet Speed of magnet (cm/s) Induced voltage (V) 2 0.6 4 1.2 6 1.8 8 2.4 (a)[1 mark]Describe the relationship between speed and induced voltage shown by the data.
(b)[2 marks]Predict the induced voltage if the speed of the magnet is increased to 10 cm/s.
Question 5
3 marks · Normal
Answer and see the solution →When a magnet is pushed into a coil of wire, a voltage is produced across the ends of the coil. The voltage disappears if the magnet stops moving.
(a)[2 marks]Explain why a voltage is only induced when the magnet is moving.
(b)[1 mark]Give one way to increase the maximum voltage produced in this experiment.
Question 6
4 marks · Normal
Answer and see the solution →A portable generator is used at a roadworks site to provide electrical power. The generator has a coil rotating inside a strong magnetic field.
Describe how electricity is produced in this generator and state two factors that will increase the amount of electricity generated.
(a)[2 marks]Describe what happens as the generator coil turns inside the magnetic field.
(b)[2 marks]State two ways the amount of electricity generated can be increased.
Question 7
3 marks · Normal
Answer and see the solution →You are given a coil of wire, a bar magnet, and a sensitive voltmeter.
Describe a practical experiment to show electromagnetic induction and how you would demonstrate that the induced voltage depends on the speed of movement.
(a)[1 mark]Describe how you would set up the apparatus to show an induced voltage.
(b)[2 marks]Describe what you would do to investigate how the induced voltage changes with speed.