Electrical Feilds

Question 1

What is an electric field?

Answer 1

The space around a charged object in which another charged object will experience a force

Question 2

What happens when a charge particle moves with an electric field?

Answer 2

Its potential energy decreases as the field does work on the particle

Question 3

What happens when a charge particle moves against an electric field?

Answer 3

Its potential energy increases as work is done on the field

Question 4

How does an electron gun work?

Answer 4

1. Metal plates are heated by a small wire that causes free floating electron in the lattice to gain Ek
2. Electrons are ‘boiled off’, allowing them to move freely in a vacuum
3. Electrons are pulled towards an anode and away from the cathode (wire), accelerating them
4. Some electrons pass through a small hole as a beam

Question 5

What is a linear accelerator and how does it work?

Answer 5

It is a series of tubes that electrons travel through. They are connected to an alternating voltage.
As the electrons leave the tube it is repelled and attracted to the tube in front. The velocity increases in between tubes.