Electric Fields (M6)

Question 1

Field direction

Answer 1

From positive to negative

Question 2

Electric field strength

Answer 2

Force experienced per unit positive charge at that point.
E = F/Q

Question 3

Uniform field strength

Answer 3

Field strength of a uniform field.
E = V/d
V = p.d.
d = plate separation

Question 4

Electric potential

Answer 4

The work done by an external force per unit positive charge to bring a charge from infinity to a point in a electric field.
V = E/q
Unit: Volt or JC^-1

Question 5

Electric potential energy

Answer 5

E = Qq / 4pi epsilon0 r

Question 6

Coulomb’s law

Answer 6

Any two point charges exert an electrostatic force on each other that is directly proportional to the product of their charges and inversely proportional to the square of their separation.

F = Qq / (4pi epsilon0 r^2)

Question 7

Force - separation graph for charge

Answer 7

Downwards curve
Area = work done

Question 8

Gravitational and electric field similarities

Answer 8

F proportional to 1/r^2
F proportional to Qq or Mm
g = F/m and E = F/Q
Both are radial fields

Question 9

Gravitational and electric field differences

Answer 9

G created by mass, E by charge
G always attractive, E depends on charge
Different equations for force

Question 10

Electric field strength

Answer 10

The force experienced per unit positive charge at that point.

Question 11

Electric potential difference

Answer 11

The work done by an external force per unit charge toove a charge between two points in an electric field.