Topic 7 Electric Fields Key Terms

Question 1

Permitivity Of Free Space

Answer 1

Property of a medium to allow an electric field to permeate through it

Question 2

Electric Field (Force Field)

Answer 2

Region of space where a charged particle experiences a force

Question 3

Coulomb’s Law (1)

Answer 3

Magnitude of force between 2 point charges directly proportional to the product of their charges

Question 4

Coulomb’s Law (2)

Answer 4

magnitude of force between 2 point charges inversely proportional to the square of the distance between them

Question 5

Absolute Electric Potential At A Point

Answer 5

Potential energy per unit charge of a positive point charge at that point in the field

Question 6

Electric Field

Answer 6

Force per unit charge experienced by a small positive test charge

Question 7

Electric Potential (1)

Answer 7

Work done per unit charge to move a positive test charge from infinity to r

Question 8

Electric Potential (2)

Answer 8

Energy needed to move a unit charge between 2 points

Question 9

Equipotential Field Lines

Answer 9

Line through the space of a field where the field strength is constant

Question 10

Capacitance

Answer 10

Charge stored by capacitor per unit potential difference

Question 11

Time Constant (1)

Answer 11

Value of time taken to discharge a capacitor to 1/e (0.37) of its initial value (of charge, current, or voltage)

Question 12

Time Constant (2)

Answer 12

Value of time taken to charge a capacitor to (1 - 1/e) (0.63) of its maximum value (of charge or voltage)