Static electricity

Question 1

how do you electrically charge a material?
-explain

Answer 1

rub 2 insulators together
-frictional forces rub electrons off from one insulator to the other

Question 2

how is a build-up of static charge a potential danger when refuelling aircraft or vehicles? how is this prevented?

Answer 2

-fuel running through the pipes generates friction needed to create a static charge.
-aircraft are earthed with a conductor during re-fuelling

Question 3

how can all static objects be discharged?

Answer 3

earthing (connecting them to the earth through a conductor)

Question 4

what so all charged objects have around them?

Answer 4

an electric field

Question 5

what does a van de graaf do?

Answer 5

-removed electrons off an object (leaving behind a positive charge)

Question 6

what do closer lines in an electrical field diagram indicate?

Answer 6

field lines reinforce eachother and result in a greater force

Question 7

state the two types of field:
where are they found?

Answer 7

radial and uniform fields
around a point
between oppositely charged plates

Question 8

Give one reason why earthing reduces the risk of fire. [1 mark]

Answer 8

The earth wire discharges the aircraft to prevent sparking which could cause a fire.

Question 9

Explain how the worker can prevent a build-up of charge when pumping fuel into the aircraft. [3 marks]

Answer 9

-They can use a conductor to connect the aircraft and the ground -
- this allows negative charge to move onto the aircraft
-which neutralises the positive charge.

Question 10

define an electric field

Answer 10

region where an electric charge
experiences a force