Forces on Charged Particles

Question 1

What direction does electric current flow?

Answer 1

Positive to negative

Question 2

What is a uniform field?

Answer 2

When the field strength is constant-field lines are equally spaced between the parallel plates

Question 3

Describe radial fields

Answer 3

Strength of the field decreases as it moves away from the charge

Question 4

Describe the effect of electric fields

Answer 4

In an electric field, a charged particle will experience a force

Question 5

Name everyday examples of electric fields

Answer 5

• the cathode rade tube
• paint spray
• photocopying and laser printing
• pollution control

Question 6

What is potential difference?

Answer 6

A measure of the work done in moving one coulomb of charge between two points in an electric field

Question 7

Where do magnetic fields occur?

Answer 7

Around current-carrying wires

Surrounding magnets

Question 8

Describe the left hand rule when working with negative charge

Answer 8

Index finger- current
Middle finger- magnetic field direction
Thumb- movement

Question 9

Name the basic parts of a particle accelerator

Answer 9

• a source of particles
• beam pipes
• accelerating structures
• a system of magnets
• a target

Question 10

Why is ac current used in particle accelerators?

Answer 10

To keep electrons flowing in the same direction