Physics (AS & A Level) · May / June 2023 · Paper 42 · Question 6
9702
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A heavy aluminium disc has a radius of 0.36 m. The disc rotates with the wheels of a vehicle and forms part of an electromagnetic braking system on the vehicle. In order to activate the braking system, a uniform magnetic field of flux density 0.17 T is switched on. This magnetic field is perpendicular to the plane of rotation of the disc, as shown in Fig. 6.1. aluminium disc, radius 0.36 m magnetic field, flux density 0.17 T rotation of disc rim axle Fig. 6.1
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6(a)(i)[2]
6(a)(ii)[2]
6(b)[3]
6(c)[3]
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