Module 6 Chapter 2 - Electric Fields

Question 1

Description of a large metal sphere’s field:

Answer 1

There is no field inside a metal sphere. The field outside the sphere is the same as it would be if all the charge were concentrated in the center.

Question 2

How can an electric field’s strength be calculated based on the movement of a charge within it?

Answer 2

E = F / Q

Question 3

What is the equation for the electric field strength at a point charge?

Answer 3

E = Q / 4π ε₀ r². Note that applying E = F / Q can be used to find the force between two point charges.

Question 4

Check ability to derive E = V / d

Answer 4

Start with E = F / Q
E = (W / d) / Q
E = (W / d) / (W / V)
E = (1 / d) / (1 / V)
E = V / d

Question 5

How does the capacitance of a capacitor relate to permittivity of the insulating material? (equation)

Answer 5

C = εA / d