SP22 P4 Q7 Solenoid Current Reversed | Specimen Paper 2022 | Cambridge A Level 9702 Physics
9702/4/SP/22 with small modification: (a) (i) Define magnetic flux. (ii) State Faraday’s law of electromagnetic induction.
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(b) A solenoid has a coil C of wire wound tightly about its centre, as shown in Fig. 7.1. The coil C has 96 turns. The uniform magnetic flux Φ, in Wb, in the solenoid is given by the expression Φ = 6.8 × 10–6 × I where I is the current, in A, in the solenoid. Calculate the average electromotive force (e.m.f.) induced in coil C when a current of 3.5 A is reversed in the solenoid in a time of 2.4 ms.
(c) The d.c. supply in Fig. 7.1 is now replaced with a sinusoidal alternating supply. Describe qualitatively the e.m.f. that is now induced in coil C.
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