Pearson Edexcel International GCSE (9–1) · PHYSICS · Unit
Magnetism and Electromagnetism
293 practice questions
Topics covered
Practice questions
71–80 of 154 · Normal
Question 71
4 marks · Normal
Answer and see the solution →Figure 1 shows a bar magnet and two identical iron nails hanging from it as in an experiment.
Figure 1: Bar magnet and two hanging iron nails (a)[2 marks]Explain why nail 1 is able to hang from the bar magnet.
(b)[2 marks]Explain why nail 2 is able to hang from nail 1.
Question 72
2 marks · Normal
Answer and see the solution →Give two ways to show that a material is magnetically soft.
Question 73
5 marks · Normal
Answer and see the solution →An iron nail and a steel nail are both placed in contact with the end of a bar magnet.
(a)[2 marks]State what will happen to each nail while the bar magnet is present.
(b)[2 marks]Describe what happens to the magnetism in each nail after the bar magnet is removed.
(c)[1 mark]Explain the difference in behaviour between the iron nail and the steel nail using the ideas of magnetically soft and hard materials.
Question 74
4 marks · Normal
Answer and see the solution →A student places two identical bar magnets flat on a table, their north poles facing each other about 5 cm apart.
(a)[2 marks]State and explain what the student will observe when trying to push the magnets closer together.
(b)[2 marks]Draw a labelled diagram to show the magnetic field pattern between the magnets.
Question 75
4 marks · Normal
Answer and see the solution →A bar magnet is placed under a piece of paper. A student sprinkles iron filings above and observes the pattern formed.
(a)[2 marks]Describe what the pattern of iron filings reveals about the shape and strength of the magnetic field around the bar magnet.
(b)[2 marks]The student now arranges two bar magnets 3 cm apart so their opposite poles face each other.
Explain how the iron filings' pattern will be different in the space between the magnets. What does this show?
Question 76
4 marks · Normal
Answer and see the solution →Two bar magnets are used in an experiment. One is made from iron and the other from steel.
(a)[2 marks]Explain why steel is used for making permanent magnets, but iron is not.
(b)[2 marks]When a small iron paperclip is placed next to a steel magnet, describe what happens to the paperclip and explain why.
Question 77
5 marks · Normal
Answer and see the solution →A technician needs to create a region with a strong, uniform magnetic field for a physics experiment.
(a)[2 marks]Describe how two permanent bar magnets should be arranged to produce a uniform magnetic field.
(b)[2 marks]Sketch or describe the magnetic field lines in the region between the two magnets.
(c)[1 mark]Explain why the field is considered uniform in this region.
Question 78
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 79
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.
Question 80
2 marks · Normal
Answer and see the solution →Explain why a wire carrying a current experiences a force when placed at right angles to a uniform magnetic field.