electric fields

Question 1

eletric field strength

Answer 1

force per unit positive charge experienced by a body in an electric filed
vector in direction that the positive charge would move

Question 2

cloumbs law

Answer 2

F = kQQ/R^2

Question 3

Permittivity of free space

Answer 3

8.85 x 10^-12 Fm^-1

Question 4

how permittivity affects electric filed

Answer 4

if point charges aren’t in a vacuum then the size of the force also depends on the permittivity of the material between them

Question 5

electric field equation

Answer 5

E = F/Q

Question 6

field line for positive charge

Answer 6

point away

Question 7

field lines for negative charge

Answer 7

point towards charge

Question 8

field lines between parallel plates

Answer 8

plate with positive voltage to the plate with the less positive voltage

Question 9

measuring electric filed lines
conducting paper

Answer 9

conducting paper used to map out 2D field lines
one positive charge on the edge of the paper and a negative charge on the opposite edge of the paper
points with same voltage can be joint up the equipotencial lines
field lines are perpendicular so they can be mapped out too

Question 10

measuring electric field lines
eletrolytic tank

Answer 10

used for 3D field lines
positive charge on one side of the tank, negative charge on the opposite side
voltmeter used to find in water where p.d. is the same
from this equipotential lines and field lines can be mapped out

Question 11

eletric field equation

Answer 11

E = KQ / r^2

Question 12

e-r graph

Answer 12

1/ x^2
area under = change in V (eletric potencial)

Question 13

uniform field

Answer 13

can be produced ny connecting two parallel plates to the opposite poles of the battery

Question 14

equation for a field in a uniform filed

Answer 14

E = V/d

Question 15

charged particle in a uniform electric field

Answer 15

a charged particle enters a field at right angles to the field
a constant force parallel to the field lines
if particle is positive then force acts in same direction as field
negative = opposite direction of foeld lines
particle accelerates at right angles to particles original motion
same in 3D field

Question 16

absolute electric potential

Answer 16

the electric potential energy that a unit positive charge would have at that point
depends on how far its from the charge creating the electric field and the size of the charge

Question 17

equation for Ep in a radial field

Answer 17

Ep = -kqq/r

Question 18

electric potential

Answer 18

electric potential energy that a unit positive charge would have at a specific point

Question 19

electric potential energy

Answer 19

energy stored by a charge particle due to its position in an electric field
equals the work done moving a charge from infinity to that position

Question 20

electric potential equation

Answer 20

V = kQ/r

Question 21

charge and force when potential is positive

Answer 21

charge is positive
force is repulsive

Question 22

charge and force when potential is negative

Answer 22

charge is negative
force is attractive

Question 23

V-r graph when charge is positive

Answer 23

1/x^2

Question 24

V-r graph when charge is negative

Answer 24

-1/x^2

Question 25

electric potential difference

Answer 25

if two points in a n electric field have different absolute electric potentials then there is a electric potential difference between them

Question 26

work done equation

Answer 26

change in W = Q X change in V

Question 27

equation for distance when F =0
g = 0 or when E = 0

Answer 27

a = (root Q1 / Q2) / (1 + root Q1 / Q2) X d

Question 28

equation for distance when V = 0

Answer 28

b = (Q1 / Q2 - Q1) X d