Electrostatics Flashcards
(8 cards)
1
Q
How to test a rod being charged
A
- use gold leaf electroscope
- gold leaf will deflect (if charged)
2
Q
Experiment to show that different rods have different types of charge
A
- balance rods on watch glass (to allow rods to swing freely)
- bring rods close together
- observe attraction AND repulsion
3
Q
How to charge an insulator
A
- friction
- with another insulator
4
Q
Why can electrostatic charge be dangerous when fueling aeroplane
A
5
Q
Why do electrostatic paint sprays have positively charged nozzles
A
- so that paint particles are positively charged (too)
- like charges repel…
- so the paint particles will repel
- producing an even coat of paint
6
Q
Why the object being painted by the electrostatic paint sprays should be earthed
A
- object will become charged too when paint particles land on it
- (without earthing) further paint particles would be repelled by the object as they have the same charge
- earthing discharges object…
- electrons transferred between earth and object
- (earthing means) paint continues to reach object (giving even coverage)
7
Q
Why is earthing good
A
- discharges object
- electrons transferred between earth and object
8
Q
Why is earthing good in electrostatic paint sprays
A
- paint continues to reach object
- giving thicker coat and even coverage
