Physics 9702 · AS & A Level · Electromagnetic induction
Electromagnetic induction — practice question
A compact coil is set near one end of a solenoid that is connected to a power supply. The plane of the compact coil is perpendicular to the axis of the solenoid, as shown in Fig. 9.1. The power supply makes the current $I$ in the solenoid vary with time $t$ as shown in Fig. 9.2.
(a(i))[2]
State Faraday’s law of electromagnetic induction in words.
(a(ii))[4]
Using the axes in Fig. 9.3, sketch a graph showing how the electromotive force (e.m.f.) induced in the small coil varies with time $t$.
(b)[2]
The small coil in (a) is now substituted with a Hall probe. The Hall probe is aligned so that the reading from the probe is at a maximum. The current $I$ in the solenoid varies once more as shown in Fig. 9.2. On the axes of Fig. 9.4, sketch a graph showing how the reading $V_H$ of the probe varies with time $t$.
Worked solution & mark scheme
This 8-mark question has a full step-by-step worked solution and mark scheme. One marking point: “induced emf varies in proportion to rate of change” …