Pearson Edexcel International GCSE (9–1) · PHYSICS · Unit
Magnetism and Electromagnetism
293 practice questions
Topics covered
Practice questions
21–30 of 154 · Normal
Question 21
2 marks · Normal
Answer and see the solution →State two ways to identify a region of uniform magnetic field between the poles of two bar magnets.
Question 22
3 marks · Normal
Answer and see the solution →Figure 1 shows two U-shaped magnets set up on a laboratory bench with their open ends facing each other and a gap between them.
The magnets are arranged so that the facing poles across the gap are north and south.
(a)[2 marks]Describe, with reference to magnetic field lines, why this arrangement produces a uniform magnetic field in the gap.
(b)[1 mark]Suggest one use for a region of uniform magnetic field in a physics experiment.
Question 23
1 mark · Normal
Answer and check →Which diagram best represents a uniform magnetic field?
- A.A set of straight, evenly spaced lines pointing in one direction
- B.A set of curved lines spreading out from a single pole
- C.Randomly scattered short lines in all directions
- D.Lines that form closed circles around a wire
Question 24
4 marks · Normal
Answer and see the solution →A student sets up two bar magnets so that their north and south poles are facing each other, close together, and then uses iron filings to observe the field.
(a)[1 mark]Describe what the student would see in the region between the two poles.
(b)[2 marks]Why do iron filings arrange themselves in straight, equally spaced lines in the region between the poles?
(c)[1 mark]How could the student confirm that the field is uniform using a plotting compass?
Question 25
2 marks · Normal
Answer and see the solution →Describe what would happen to the uniformity of the magnetic field if one of the bar magnets was moved further away from the other.
Question 26
3 marks · Normal
Answer and see the solution →A physics teacher wants to demonstrate the effect of two overlapping magnetic fields produced by two bar magnets. Explain how overlapping the fields from the two magnets can create a neutral point and how this can be identified in practice.
Question 27
2 marks · Normal
Answer and see the solution →A student measures the force on a current-carrying conductor placed in a magnetic field at several positions between the two poles of a magnet. The results are shown below.
Table 1: Force measurements at different positions in the magnetic field Position Force (N) 1 0.20 2 0.20 3 0.20 What do these results suggest about the magnetic field in the region tested? Give a reason for your answer.
Question 28
3 marks · Normal
Answer and see the solution →In an experiment, you want to create the most uniform magnetic field possible using two permanent bar magnets.
(a)[2 marks]Describe the best arrangement of the magnets to produce a uniform field.
(b)[1 mark]Explain why this arrangement produces a uniform field.
Question 29
4 marks · Normal
Answer and see the solution →A student places a steel nail and an iron nail near a bar magnet and observes what happens.
(a)[2 marks]Explain what is meant by 'induced magnetism' in this context.
(b)[2 marks]Both nails become attracted to the magnet, but only one remains magnetised after removing the magnet. Which one, and why?
Question 30
2 marks · Normal
Answer and see the solution →State two features of a magnetic field that are shown by field lines.