Electric Fields

Question 1

State coulombs law

Answer 1

the electrostatic force between two point charges, separated by a distance is directly proportional to the product of the two charges and inversely proportional to the square of their separation

Question 2

What is electric field strength?

Answer 2

the force per unit charge exerted on a positive charge placed at that point - it is a vector quantity

Question 3

What is the absolute electric potential?

Answer 3

the work done per unit charge in bringing a small positive test charge from infinity to that point

Question 4

When is work done against the electric field?

Answer 4

like charges approach and opposite charges recede

Question 5

When is work done by the electric field?

Answer 5

like charges recede, opposite charges approach

Question 6

Describe an equipotential surface

Answer 6

constant potential, field lines perpendicular to surface, work would have to be done to move q from an inner to outer surface, no work done if q moves along surface