6.2 - Electic Fields

Question 1

What is an Electric Field?

Answer 1

The region around a body in which other charged bodies will feel a force due to the electric charge of the body

Question 2

What is Electric Field Strength?

Answer 2

The force per unit positive charge. Measured in Newtons per Coulomb. It is the force that a charge of +1C would experience if placed at that point in the field

Question 3

What is Coulombs Law?

Answer 3

The electrical force between two point charges is directly proportional to the product of their charges and inversely proportional to the Square of their seperation

Question 4

What is the Permittivity of Free Space?

Answer 4

A physical Constant related to the size of the force between Electric charges in free space

Question 5

What is Permittivity?

Answer 5

A constant related to the size of the Capacitance of a capacitor

Question 6

What is the Relative Permittivity of a material?

Answer 6

The factor by which the Capacitance of a capacitor with that material between its plates is increased relative to the Capacitance of a capacitor with air or vacuum between its plates

Question 7

What is Electric Potential?

Answer 7

The work done per unit positive charge to move that charge from infinity (where the potential is zero) to a point in an electric field

Question 8

What is the Electric Potential Energy of a body?

Answer 8

The work done to move that charge from infinity to a point in an Electric Field

Question 9

What do electric field lines show?

Answer 9

The shape of the field and the direction of the field line at a point is the direction in which a small positive charge would move when placed at that point