Electric fields

Question 1

What is coulombs law?

Answer 1

The force between two point charge is equal to

F = Q1Q2/4piε0r^2

(If charge is the same sign, it is repulsive)

Question 2

What is uniform field strength?

Answer 2

E = F/Q

Question 3

What is potential gradient

Answer 3

​The change of potential per metre at a point in the field

Question 4

What happens when a charged particle enters a field

1)directly

2) in parallel

Answer 4

1) it will change direction

2) it continues moving in the same direction

Question 5

What is the direction of field lines from a positive source?

Answer 5

Coming forward from the charged object.

Question 6

What is field strength in relation to potential

Answer 6

The derivative of potential, with respect to r

Question 7

What is force in relation to field strength?

Answer 7

field strength* charge

Question 8

What is force in relation to potential energy

Answer 8

The derivative of potential energy

Question 9

What is potential energy in relation to potential

Answer 9

potential* charge

Question 10

What is absolute potential energy?

Answer 10

the potential difference between a point, and a point at zero potential, which is infinitely far away

Question 11

What is potential difference?

Answer 11

The work done, against an electric field, in moving unit charge from one point to a second point at a higher potential. If a charge moves from a point of higher potential to lower potential, work is done by an electric field.

Question 12

How do potential gradient, and field strength change, around a radial field of a sphere?

Answer 12

They are both greater near the surface, than they are, further away

Question 13

Is work done, in moving a charged particle along equipotential surface, and why?

Answer 13

No, because work done = the work done on a charge is the change in potential, multiplied by the charge.