3.7.3.2 - Electric Field Strength

Question 1

Where does charge move?

Answer 1

Positive to negative.

Question 2

What do electric field lines show?

Answer 2

The path a small positive test charge would follow.

Question 3

In radial fields describe the movement of charge if the sphere is positive.

Answer 3

To infinity, away from the centre.

Question 4

In radial fields describe the movement of charge if the sphere is negative.

Answer 4

From infinity so towards the centre.

Question 5

Describe the movement of an electron in a uniform field.

Answer 5

Electron moves towards the positive side in a parabola shape.

Question 6

What is electric field strength? (E)

Answer 6

The force per unit charge acting on a small positive test charge at that point.

Question 7

Is electric field strength a scalar or vector?

Answer 7

Vector.

Question 8

What happens to field strength in a uniform field?

Answer 8

Stays constant as field lines stay the same concentration.

Question 9

What happens to electric field strength in a radial field?

Answer 9

Field strength drops with distance as field lines become further apart.

Question 10

What is E measured in?

Answer 10

NC-1 or Vm-1

Question 11

What is E proportional to?

Answer 11

1 / r^2

Question 12

Describe E r graph for replying

Answer 12

Smooth curve downwards like a c

Question 13

Describe the E r graph for attracting

Answer 13

Reflected in x axis for repelling