A-LevelPhysicsMagnetic fieldsMay/June 2018Paper 4 Q98 Marks
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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