Chapter 7.3: Electric Fields

Question 1

What symbol represents the permittivity of free space?

Answer 1

ε0

Question 2

When calculating the force between two particles, what can air be treated as?

Answer 2

A vacuum.

Question 3

For a charged sphere the charge can be assumed to be at what part of the sphere?

Answer 3

The centre.

Question 4

Which is stronger? The gravitational force of subatomic particles or electrostatic force.

Answer 4

The electrostatic force.

Question 5

Electric field lines always go from _______ to ______.

Answer 5

1. Positive charge to
2. negative charge

Question 6

What is electric field strength?

Answer 6

The force per unit charge acting at a point in an electric field.

Question 7

What is the magnitude of E (electric field strength) in a uniform electric field?

Answer 7

Potential difference between plates (V)/ distance between plates.

Question 8

What is the trajectory of a particle entering a uniform field at right angles?

Answer 8

It is parabolic.

Question 9

How is electric potential related to electric field strength?

Answer 9

E = ΔV/Δr
The change in electric potential with respect to the change in radius length.