# Questions, Problems: Electrical quantities

Fill in the missing words:

1. Like charges . . . . . . . . . . . . . . . . , unlike charges . . . . . . . . . . . . . . . . .
2. When polythene is rubbed with wool, some . . . . . . . . . . . . . . . . . . leave the  . . . . . . . . . . . . . . . . . .  and move on to the . . . . . . . . . . . . . . . . .  so that the polythene becomes . . . . . . . . . . . . . . . . . . charged and the wool is left . . . . . . . . . . . . . . . . . .
3. When rubbed, cellulose acetate becomes . . . . . . . . . . . . . . . . . . charged because it . . . . . . . . . . . . . . . . . . some electrons.
4. A negatively-charged object attracts a piece of paper because it . . . . . . . . . . . . . . . . . . some electrons away from the surface of the paper.
This leaves the surface of the paper . . . . . . . . . . . . . . . . . . . . . . charged so that it is . . . . . . . . . . . . . . . . . . . . . . . to the object.
These separated charges are called . . . . . . . . . . . . . . . . . . . charges.
5. In a gold-leaf electroscope, the leaf rises because like charges . . . . . . . . .
6. Conductors (unlike . . . . . . . . . . . . ) allow . . . . . . . . . . . . . . . . . . to travel through them.
7. Sharp points . . . . . . . . . . their charge easily by . . . . . . . . . . . . . . . . . . . the air.
The . . . . . . . . . . . . . . . . . . at the top of a lightning conductor loses  . . . . . . . . . . . . . . . . . . to the clouds to neutralise them so that they are less likely to produce a flash of . . . . . . . . . . . . . . . . . . .
8. Charges are measured in . . . . . . . . . . . . . . . . . . and can be stored in  . . . . . . . . . . . . . . . . .