(a(i))[2]
On Fig. 10.1, indicate (1) the S-pole of the iron core, and (2) the N-pole together with the S-pole of the iron armature.
(a(ii))[2]
The cell is reversed. State the effect on the poles and on the armature.
(a(iii))[2]
Explain why the core is made of iron rather than steel.
(b(i))[1]
State what component X is called.
(b(ii))[2]
Explain why the bell rings when the temperature of X increases.
(b(iii).1)[2]
Calculate the p.d. across X.
(b(iii).2)[1]
Calculate the potential difference across the coil.
(b(iii).3)[2]
Calculate the current supplied by the battery.
(b(iv))[1]
Component X is removed from the circuit and replaced with a different component Y. The bell now rings when bright light shines on Y. State the name of component Y.