A-LevelPhysicsMagnetic fieldsOct/Nov 2018Paper 4 Q98 Marks
A solenoid S is wound on a soft-iron core, as shown in [Figure 9.1]. A coil C having 120 turns of wire is wound on to one end of the core. The area of cross-section of coil C is 1.5 cm². A Hall probe is close to the other end of the core. When there is a constant current in solenoid S, the flux density in the core is 0.19 T. The reading on the voltmeter connected to the Hall probe is 0.20 V. The current in solenoid S is now reversed in a time of 0.13 s at a constant rate.
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