Pearson Edexcel International GCSE (9–1) · PHYSICS · Unit
Magnetism and Electromagnetism
293 practice questions
Topics covered
Practice questions
151–154 of 154 · Normal
Question 151
6 marks · Normal
Answer and see the solution →A student investigates how to create a uniform magnetic field using two bar magnets in the laboratory.
(a)[2 marks]Describe and draw the arrangement of two bar magnets to produce a uniform magnetic field between them.
(b)[2 marks]Explain why the field in the region between the magnets is described as 'uniform'.
(c)[1 mark]Give one use of a uniform magnetic field in a scientific or technical device.
(d)[1 mark]Suppose the magnets are moved further apart. Describe what happens to the uniform region.
Question 152
5 marks · Normal
Answer and see the solution →The diagrams below show the magnetic field around a straight wire and a solenoid carrying a current.
(a)[2 marks]Draw the magnetic field lines around a straight wire carrying current.
(b)[2 marks]Explain how the right-hand grip rule can be used to determine the direction of these field lines.
(c)[1 mark]Describe one way to increase the strength of the magnetic field around a solenoid.
Question 153
5 marks · Normal
Answer and see the solution →A coil of wire is connected to a sensitive ammeter. A bar magnet is brought quickly towards the coil and then away from it.
(a)[2 marks]State and explain what the ammeter shows as the magnet moves towards the coil.
(b)[1 mark]Describe what happens if the magnet is then held stationary inside the coil.
(c)[2 marks]Name the effect shown in this experiment and explain why the current changes direction when the magnet is pulled back out of the coil.
Question 154
4 marks · Normal
Answer and see the solution →A student uses the following measurements from a transformer: input current = 0.3 A, input voltage = 230 V, output current = 3.0 A. The transformer is 100% efficient.
(a)[3 marks]Calculate the output voltage of the transformer.
(b)[1 mark]State the correct SI unit for current and for voltage.