A rubber balloon that starts off uncharged is rubbed against a woollen cloth, as shown in Fig. 5.1. After rubbing, the balloon becomes negatively charged.
Fig. 5.1 includes boxes with the words: "balloon gains [blank] and becomes negatively charged" and "woollen cloth loses [blank] and becomes [blank] charged".
(a(i))[2]
Complete the labels on Fig. 5.1.
(a(ii))[2]
Explain why the balloon remains negatively charged for a long time.
(b)[3]
Rubbing the balloon makes the air inside it warmer. Explain, in terms of the particles of air, why the volume of the balloon increases as the air temperature rises.
Worked solution & mark scheme
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