5. Electric Fields

Question 1

Insulating Materials

Answer 1

Do not contain free electrons but can sometimes become charged easily because their surface atoms easily gain or lose electrons

Question 2

Shuttling Ball Experiment

Answer 2

Shows that an electric current is a flow of charge

Question 3

Gold Leaf Electroscope

Answer 3

Is used to detect charge

Question 4

Field Line in an Electric Field

Answer 4

A line which a small positive charge placed in the electric field follows if it is free to move

Question 5

Uniform Field

Answer 5

Field lines are parallel to one another

Question 6

Electric Field Strength, E at a point in an electric field

Answer 6

The force per unit charge on a positive test charge placed at that point

Question 7

Electrical Conductors

Answer 7

Contain free electrons and allow a flow of charge

Question 8

Electric Potential

Answer 8

The work done per unit positive charge on a ‘positive test charge’ when it is moved from infinity to that position

Question 9

Electric Potential Energy

Answer 9

The work done to move a small positive test mass from infinity to that point

Question 10

Potential Gradient

Answer 10

The change of potential per unit change of distance in a given direction from a point in an electric field