Chapter 22 - Electric Fields

Question 1

What is electric field strength?

Answer 1

The force experienced per unit charge within an electric field

Question 2

What do the field lines on an electric field diagram show?

Answer 2

The arrows show the direction a positive charge would experience a force.
The field lines are always at a right angle to the surface of a conductor
The closer the lines are together the greater the field strength.

Question 3

State Coulomb’s law

Answer 3

The electrostatic force between two objects is:

directly proportional to the product of their charges

and inversely proportional to the square of the distance between them

Question 4

What can a uniformly charged sphere be treated as?

Answer 4

A point charge

Question 5

Define electric potential

Answer 5

The work done per unit charge in bringing a positive charge from infinity to that point

Question 6

Define electric potential energy

Answer 6

The work done in bringing a positive charge from infinity to that point in an electric field

Question 7

What is the electric potential at a point directly in between two equal and opposite charges?

Answer 7

0

Question 8

What is the unit for electric field strength?

Answer 8

NC^-1

Question 9

What is the electric potential at a point directly in between two equal and positive charges?

Answer 9

2 x the electric potential at that point in one of the fields

Question 10

What is the electric field strength at a point directly in between two equal and positive charges?

Answer 10

0

Question 11

What is the electric field strength at a point directly in between two equal and opposite charges?

Answer 11

2 x the electric field strength at that point in one of the fields

Question 12

Is electric field strength a vector or a scalar?

Answer 12

Vector

Question 13

Is electric potential a vector or a scalar?

Answer 13

Scalar