Summary Electrostatics IEB Matric Notes

-Electrostatics


Coulomb's Law Two point to the
:
charges exert forces on each other .The force is directly proportional product

of the
charges and
inversely proportional to the square of the distance between the
charges
-




?

i
F = 1992 Table of Conversion :
" ·
c) -
10
- 2
·


n) -
-




10
12



I
10
12
F
-




Force between objects x(
charged (N) mc
· ·

· I
- -
10 I
2



!
-
I b
k Coulomb's constant 19 10 N . C
(
-




x ?........
.


m2
.




' ---


q
Charge
*
on objects (I

Distance between
charges
j ·
(m)



204)
%
(-1
/(5
.
10 .




InC 2xC FAonB = 19 .

10 % 10 06
5N) ,
-




A Gam B 4 cm E

= -

12 , 5 C




[
7 12072
184]
Fret = 12 , 5-11 , 25 .




Eson) = 19 .

10 % 10 , 0472
= 1 , 25N left

=
= 11 , 25




PrincipleotConservation ofCharge-
Q + Q2

Qnew = 2




Objects have
·
will
equal charge

Transter ofElectrons -




Q

Ne =
qe


Ne Number of electrons transferred

Q transferred
Charge
*




ge a
Charge of
on electron (1 ,
6 .
10 C)


- Eriangle _
Vectors
FAon B = 19 .

209(10 20 % (5 .
.
10 %

5u) -

15xC 10 , 008)
15mm
B C


- 031 , 25N South
=




8 mm




A -


10pC
Fionc = (9 .

109(5 .
10
%
))- 15 .
10
10 , 015)2
3000N
&

-

&
= 3 OON East
7031 25 ,


X
- 3000
7031 ,
25
O
1
Jan8 =
7031 , 25


Fres" = <031 ,
25 + 3 000 Y
3000
= 58438476 56 0 = 23 118
, ,




: Fres =< 644N at 23 ,
118