Transcript Sumber Gambar : site: gurumuda.files.wordpress.com Sumber Gambar Fisika SMK Teknologi, Direektorat SMK Hard ruber stick, a Stick of glass or a ruler of plastic.

Sumber Gambar : site:
gurumuda.files.wordpress.com
Sumber Gambar Fisika SMK Teknologi,
Direektorat SMK
Hard ruber stick, a Stick of glass or a ruler
of plastic is scrubed in cloth
Phenomenons 0f
Static electricity
Plastic ruler is scrubed in
dry hair
Iron nyilon cloth
and all that
Phenomenons of StaticCreated
electricity
by Jamari,
Hal.: 2
S.Pd. Adaptif

Anything is scrubed in different thing with the result that static electricity, so
thing is called containt electric charge.
Two plastic rulers and two glass sticks are scrubed by drugget so each are
be charge
The two of ruler mutual refuse to
averse
Sumber Gambar Modul Listrik Statis,
Direktorat Pendidikan Menengah
Kejuruan
Phenomenons of StaticCreated
electricity
by Jamari,
Hal.: 3
S.Pd. Adaptif
The two of glass sticks mutual refuse
to averse
A plastic ruler and a glass stick are
trade-offs
Phenomenons of StaticCreated
electricity
by Jamari,
Hal.: 4
S.Pd. Adaptif
Everything that is pulled glass so pussed away plastic ruler
Everything that is pussed away glass so pulled plastic ruler
positive
charges (+)
The Phenomenons show
there are two kinds of
electric charges
negative
charges (-)
Franklin choose electric charges in glass as positive charges,
and electric charges in plastic as negative charges. On time
the treaty still are used
there are two kinds of electric Created
charges
by Jamari,
Hal.: 5 S.Pd. Adaptif
Have symbol Q or q
SI unit electric charge is Coulomb (C)
Electric Charge
Elementary charge is 1,6 x 10 -19 C
The charge on a single electron is 1.6 x 10 -19 Coulomb
The charge on a single proton is +1.6
x 10 -19 Coulomb
Electric
Created
Charge
by Jamari,
Hal.: 6
S.Pd. Adaptif
F12 = force at particle 1 by particle 2 ( Newton )
F 21 = force at particle 2 by particle 1 (Newton )
r
= the distance of separation between the two
objects (meters )
k
= a proportionality constant known as the
Coulomb's law constant
is dependent upon the medium that the
charged objects are immersed in
k
In the case of air & vacuum , the value is
approximately 9,0 x 109 Nm2 / C2
Coulomb’S Law
Created
Class XIIby Jamari,
Hal.: 7
S.Pd. Adaptif
Value k (constanta ) besides air or vacuum
k
1
4
  K. o

o
= permitivitas a media
= permitivitas of air or vacuum
K = dielectrik constanta
For air or vacuum
K=1
Hukum
Created
Coulombby Jamari,
Hal.: 8
S.Pd. Adaptif
=F
F
k
1
4
  K. o
Hukum
Created
Coulombby Jamari,
Hal.: 9
S.Pd. Adaptif
Contoh soal
On the air found two electricity charge 10 μC and 40 μC and apart in
distance 20 cm
a. How much is big load second interaction force?
b. When does second load laided at a medium that has dilelectric
constant 3, how much is force that undergone by 40 μC ?
Hukum
Created
Coulombby Jamari,
Hal.: 10
S.Pd. Adaptif
Penyelesaian :
a.
Hukum
Created
Coulombby Jamari,
Hal.: 11
S.Pd. Adaptif
b.
= 30 N
Hukum
Created
Coulombby Jamari,
Hal.: 12
S.Pd. Adaptif

An electric field is said to exist in the region of space around a
charged object. When another charged object enters this electric
field, an electric force acts on it.
A convenient way of
visualizing electric field
patterns is to draw lines
that follow the same
direction as the electric
field vector at any point.
These lines, called electric
field lines
Medan Listrik di sekitar
Created
muatanby Jamari,
Hal.: 13
S.Pd. Adaptif
E
Electric field lines penetrating two
surfaces. The magnitude of the
field is greater on surface A than
on surface B
The number of lines per unit
area through a surface
perpendicular to the lines is
proportional to the
magnitude of the electric
field in that region
Sumber : Halliday-Resnick-Walker
The magnitude of the electric
Created
fieldby Jamari,
Hal.: 14
S.Pd. Adaptif
the electric field E at a point in space is defined as the electric
force F acting on a positive test charge q placed at that point
divided by the magnitude of the test charge
E
.
F
E
q
Elctric field
belong Vector
QUANTITIES
E = electric field ( N/C)
q = electricity charg
(Coulomb)
F = static electricity charge
(Newton)
it has value
it has direction
Kuat Medan
Created
Listrik
by Jamari,
Hal.: 15
S.Pd. Adaptif
 Electricity field intensity direction is unidirectional and
correlating to squeez with the electric force F acting on a
positive test charge q placed at that point divided by the
magnitude of the test charge
B
.
E
+
A
.
E
Arah kuat medan
Created
listrik
by Jamari,
Hal.: 16
S.Pd. Adaptif
B
.
E
-
A
.
E
Arah kuat medan
Created
listrik
by Jamari,
Hal.: 17
S.Pd. Adaptif
At point C doesn’t has
electric field
Medan
Created
Listrik
by Jamari,
Hal.: 18
S.Pd. Adaptif
There is a point
between two
electricity charge
that has
strongest Electric
Field
Medan
Created
Listrik
by Jamari,
Hal.: 19
S.Pd. Adaptif

The electric field at a point, such as A, that has distance of electrical
charge particale as Q
In order to determine electric filed at
point A we put electricity charge as q
at point A.
+
Q
E=
r
F
q
=
qxQ
k 2
r
q
A
.
E=
E
F
q
Q
= k
r
Q
2
Kuat Medan Listrik di sekitar muatan titik
E= k
r2
Created by Jamari,
Hal.: 20 S.Pd. Adaptif
Field lines representing a
uniform electric field
penetrating a plane of area A
perpendicular to the field.
The electric flux E through
this area is equal to EA
=ExA
Sumber : Haliday Resnick, 745
Fluks
Created
Listrik
by Jamari,
Hal.: 21
S.Pd. Adaptif
When area A is at
an angle  to the
field:
 = E x A cos 
Sumber : Haliday Resnick, 745
Fluks
Created
Listrik
by Jamari,
Hal.: 22
S.Pd. Adaptif
The net flux through any
closed surface surrounding a point
charge q is given by q/o
Karl Friedrich Gauss
(1777–1866)

Hukum
Created
Gausby Jamari,
Hal.: 23
Q
o
S.Pd. Adaptif
the net electric flux through a
closed surface that surrounds no
charge is zero
 0
Hukum
Created
Gausby Jamari,
Hal.: 24
S.Pd. Adaptif
If E is perpendicular to area A, so
=ExA
=
Q

o
Q = electrical charge in closed
surface ( Coulomb )
ExA=
E=
Q

o
Q

o
E=
A

 = charge density ( C/m2 )


o
o=
permitivitas of air or vacuum
= 8,85 x 10-12 C2 N-1m-2
Hukum
Created
gaus
by Jamari,
Hal.: 25
S.Pd. Adaptif