ON22 P42 Q8 Mutual Inductance Graphs | Oct/Nov 2022 | Cambridge A Level 9702 Physics

Описание: 9702/42/O/N/22: (a) State Lenz’s law of electromagnetic induction.

(b) Two coils of insulated wire are wound on an iron bar, as shown in Fig. 8.1. There is a current I1 in coil 1 that varies with time t as shown in Fig. 8.2.

(i) The variation with t of I1 can be represented by the equation I1 = XsinYt where X and Y are constants. Use Fig. 8.2 to determine the values of X and Y. Give units with your answers.

(ii) The current in coil 1 gives rise to a magnetic field in the iron bar. Assume that the flux density of this magnetic field is proportional to I1. An alternating electromotive force (e.m.f.) is induced across coil 2. The p.d. across coil 2
is measured using the voltmeter and has a root-mean-square (r.m.s.) value of 4.6V. On Fig. 8.3, sketch a line to show the variation with t of V2 between t = 0 and t = 0.08s.

(iii) Use the laws of electromagnetic induction to explain the shape of your line in (b)(ii).
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