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GCSE Level Questions: Magnets and Electromagnets

Q9.

(a) The diagram below shows the magnetic field pattern around a bar magnet.

Draw an arrow at point A and point B to show the direction of the magnetic field at each point.

[1 mark]

(b) A magnets can be one of several types: an electromagnet, an induced magnet or a permanent magnet.

A bar magnet produces its own magnetic field.

What type of magnet is a bar magnet?

[1 mark]

(c) Which of the following sketch graphs shows how the strength of the magnetic field varies with distance from the bar magnet?

Give a reason for your answer.

[2 marks]

(d) The diagram shows an electromagnet being used to separate aluminium cans from steel cans.

(i) Explain how the electromagnet and conveyor belt are used to separate the steel cans from the aluminium cans.

[2 marks]

(ii) At the top of the table the strength of the magnetic field is only just enough to pick the cans up. Describe two ways to increase the strength of magnetic field at the top of the table.

[2 marks]

(iii) The conveyor belt moves a can at a speed of 1.7 m/s.

Calculate the time taken to move the can 3.3 m at this speed.

Give your answer to 2 significant figures.

[4 marks]

(TOTAL 12 marks)