(a)[2]
State Faraday’s law relating to electromagnetic induction.
(b)
A solenoid $S$ has a small coil $C$ positioned close to one end, as illustrated in Fig. 11.1.
(b(i))[1]
State two times at which no electromotive force (e.m.f.) is induced in coil $C$.
(b(ii))[1]
State two times at which the induced e.m.f. in coil $C$ is at a maximum, but with opposite polarities.
(c)[3]
In (b), the alternating current in solenoid $S$ is replaced by a constant current of $5.0\,\text{A}$. Calculate the average e.m.f. induced in coil $C$ when the current in solenoid $S$ is reversed in a time of $6.0\,\text{ms}$.