Physics 9702 · AS & A Level · Electromagnetic induction
Electromagnetic induction — practice question
A solenoid is wired in series with a battery and a switch. A Hall probe is positioned near one end of the solenoid, as shown in Fig. 7.1. The current in the solenoid is turned on. The Hall probe is then moved until the reading is at its greatest. The current is later turned off.
(a)[3]
The solenoid current is now turned on once more. After several seconds, it is turned off. The Hall probe is left in the same position. On the axes in Fig. 7.2, sketch a graph to show how the Hall voltage $V_H$ varies with time $t$.
(b(i))[2]
State the rule describing electromagnetic induction that is named Faraday’s law.
(b(ii))[3]
On the axes in Fig. 7.3, sketch a graph to show how the induced e.m.f. $E$ in the coil changes with time $t$ when the solenoid current is switched on and later switched off.
Worked solution & mark scheme
This 8-mark question has a full step-by-step worked solution and mark scheme. One marking point: “$V_H$ rises from zero as current switched on” …