ON18 P41 Q9 Induced emf & Hall Voltage Solenoid | Oct/Nov 2018 | CAIE A Level 9702 Physics
Автор: ETphysics
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9702/41/O/N/18: (b) A solenoid S is wound on a soft-iron core, as shown in Fig. 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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(i) Calculate the reading on the voltmeter connected to coil C during the time that the current is changing.
(ii) Complete Fig. 9.2 for the voltmeter readings for the times before, during and after the direction of the current is reversed.
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