Physics 5054 · O Level · Electromagnetic induction
Electromagnetic induction — practice question
Fig. 7.1 shows a section of a torch. No battery is fitted inside the torch. When the torch is shaken, the magnet moves back and forth through the coil.
(a(i))[2]
Explain why an electromotive force (e.m.f.) is generated in the coil when the magnet moves.
(a(ii))[1]
State one method for increasing the induced e.m.f.
(b(i))[1]
Draw the circuit symbol for an LED in the space below.
(b(ii))[1]
An LED gives out light more efficiently than a filament lamp. Explain what this statement means.
Worked solution & mark scheme
This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Magnetic flux or field present” …