Pearson Edexcel International GCSE (9–1) · PHYSICS · Unit
Magnetism and Electromagnetism
293 practice questions
Topics covered
Practice questions
71–80 of 139 · Easy
Question 71
3 marks · Easy
Answer and see the solution →The picture below shows three iron paperclips hanging from the end of a bar magnet.
(a)[2 marks]Explain why the paperclips are able to stick to each other.
(b)[1 mark]Suggest what will happen if the magnet is taken away from the top of the row of paperclips.
Question 72
2 marks · Easy
Answer and see the solution →A bar magnet is brought close to the end of an iron rod.
(a)[1 mark]State what happens to the iron rod.
(b)[1 mark]Explain why this happens.
Question 73
2 marks · Easy
Answer and see the solution →Explain why induced magnetism in iron is useful for electromagnets.
Question 74
4 marks · Easy
Answer and see the solution →(a)Iron nails are placed near a bar magnet on a sheet of paper. The teacher sprinkles iron filings around the bar magnet and taps the paper gently. Describe what pattern would be formed by the iron filings, and what this shows about the magnetic field.
(i)[1 mark]State what happens to the iron nails near the magnet.
(ii)[1 mark]Explain why the iron filings make lines and the shape of these lines.
(b)[2 marks]The teacher removes the bar magnet and the iron filings are brushed away. At the same spot, the teacher places a steel nail instead of an iron nail. What difference would you expect in how long the nail remains magnetised after the magnet is removed? Explain your answer.
Question 75
4 marks · Easy
Answer and see the solution →(a)[2 marks]List two materials that magnets can attract and two materials they cannot attract.
(b)[2 marks]Explain, using the idea of magnetic materials, why magnets attract some objects but not others. Give an example of a practical use of this property.
Question 76
1 mark · Easy
Answer and see the solution →State what is produced around a conductor when an electric current flows through it.
Question 77
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 78
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 79
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 80
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.