Electric Fields

Question 1

State Coulomb’s law

Answer 1

Coulomb’s law states that the electrical force between two charged objects is directly proportional to the product of the quantity of charge on the objects and inversely proportional to the square of the separation distance between the two objects

Question 2

is the force between two like charges positive or negative?

Answer 2

repulsive. F is positive

Question 3

is the force between two opposite charges positive or negative?

Answer 3

attractive. F is negative

Question 4

What does ε0 represent?

Answer 4

Permittivity of free space

Question 5

Define electric field strength

Answer 5

force per unit charge
acting on a positive charge

Question 6

electric field strength unit

Answer 6

Newtons per Coulomb

Question 7

Define electric potential at a point in an electric field

Answer 7

work done per unit charge on a small positive test charge required to move it from that point to infinity in the field

Question 8

Electric field strength is a vector - in which direction does it act?

Answer 8

In the direction of the force acting on a positive charge

Question 9

What is the electrical potential difference between one point and another?

Answer 9

The work done per unit charge to move an object between these points.

Question 10

what happens to a charge moving along an equipotential

Answer 10

-no work is done
-no movement in direction of force
-kinetic energy is constant
-potential energy is constant