A rigid copper wire is held horizontally between the pole pieces of two magnets, as shown in Fig. 9.1. [Figure 9.1] The width of each pole piece is 8.5cm. The uniform magnetic flux density B in the region between the poles of the magnets is 3.7mT and is zero outside this region. The angle between the wire and the direction of the magnetic field is θ. The current in the wire is in the direction shown on Fig. 9.1.

Q: What topic does this question test?

This question tests Magnetic fields in A-Level Physics (syllabus code 9702). It is worth 8 marks.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Physics May/June 2018 examination, Paper 4 Variant 3 (9702_s18_qp_43.pdf).

Question

A rigid copper wire is held horizontally between the pole pieces of two magnets, as shown in Fig. 9.1. [Figure 9.1] The width of each pole piece is 8.5cm. The uniform magnetic flux density B in the region between the poles of the magnets is 3.7mT and is zero outside this region. The angle between the wire and the direction of the magnetic field is θ. The current in the wire is in the direction shown on Fig. 9.1.

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