Electric Fields (P1)

Question 1

Key points

Answer 1

A charged particle has an electric field
Similar charges repel due to the field
Electrons move between materials due to friction
Electrons move through conducting but not insulating materials

Question 2

Moving a charged rod raises the gold leaf because..

Answer 2

They must have the same charge as the negative field of the rod attracts positives

Question 3

Where is a field strongest?

Answer 3

Closer to the object

Question 4

What is the potential difference of earth?

Answer 4

0 volts

Question 5

van de Graaf generator

Answer 5

Two insulators are rubbed together passing electrons through friction
Carried upwards until it reaches the dome where it is discharged to the Earth
Electrons are passed upwards making the tin lids negative so they repel
Spark when the earthed ball is near the generator because electrons are carried through and ionize the air