This comprehensive guide to electrostatics for Grade 12 IEB Physical Science includes the study of electric charges, Coulomb’s law, and electric field strength. It details the interactions between like and unlike charges, field lines, and the principles behind forces acting on charges. Ideal for ...
C F S
STATTIK ELECTIRIICIIITY a) draw free
body diagram of forces acting on 4MC charge
y
&
electric charge (a) - - -
4 MC
>
attraction ((unlike) repulsion (2 like)
the charge of an object will be a multiple of elementary charge SMC 4UC charge 4UC charge
*
Force of 6 MC
> :
Force of -
on on
& =
Number of electrons (or protons) x 1
,
6 X18
+
C
b) calculate electrostatic force of SNIC charge on 4MC charge .
· charge of electron elemen a se F =
1991
= (9x189)(8x10 %)4x10) = 1
, 8N attraction to the left
hollow sphere
↳
(48x18-2)2
units
her
:
negatively charged
c) calculate electrostatic force of JNIC charge on the 4MC charge . positively charged
MilliCoulomb : 1mc = 1 x 153(
10 C
= =
19 : 9 =
1909(6x10
% (4X103) =
5 4N attraction to the right
IMC
,
microCoulomb : =
1 x
- + + + + + + + + +
10- 2)
p
(20 x
nanocoulomb Inc =
1 x15
*
C electric feild between oppositely charged
d) determine the 4 MC charge .
:
net force acting on the
---
-----
parallel plates
= ,g
*
plcCoulomb :
(p)
=
1 X15 C Free -
=
3 6N to the right
,
electrostatic forces two
---------
example :
↳ occur between objects which are charged like charges repel 9, =
18MC electric feild strength (E)
-
,
- 7
as find electrostatic force of at due to al
i
and unlike charges attract
(9x189)(18x10 -)(12x18) the magnitude of the electric feild strength is defined as the
3m gres F =
May =
>
E
S·
F 93
= -
45MC
r2
0 , 216N upwards
(3)2 force (f) per unit positive charge
like charges repel -
+
- - - - - - -
=
pon a
&estaforexpriencedbucharge
at that
12m)s
=
92 +
3m
=
[
find net force on a
C)
b) find electrostatic force on ge duetoas
Fnet" =
(0 , 216) + (0 54)2,
(9x189)(45x10 6)(12x18
F
F (N C")
F
attract electric feild strength at that point
unlike charges F ka
.
=
=
Fret =
0
, 582N
r2 (3)2
Coulomb's Law =
0 . 54N to the right tano- : 0 =
21 ,
80
above
horizonal
electric field strength due to a point charge
> definition :
Two point charges in free space or air exert forces on > electric field strength decreases as distance from charge increases
eachother . The force is directly proportional to the product of the electric field lines (more lines closer together =
stronger) Coulomb's constant
>
-
1 C .
· area
charges and inversely proportional to the square of the distance electric field :
A region of space in which an electric charge experiences
I
7
responsible for
91 92
between the charges r a force
-[ > +
t test charge
marix
+ electric
test charge
strength
7
Feild
(N C") too (m)
=
.
:
(f
92 -A
91
F
.
=
k 1. electric fella strength is
inversely proportional to the square of distance from
distance between
rz point charge a (EC)
Mi
electrostatic
point charges (m)
>
-
force (N)
electric feld due to a
2 Charge a is responsible for electric feild Increasing charge a will increase
fold due
.
to a negative
.
electric
Coulomb's constant (9x10 9 N .
m ? c") positive point charge
the felld strength
point charge
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