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ELECTROSTATIC
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Daftar Isi
Listrik Statis
Hukum Coulomb
Elektroskop Generator Van De Graaff
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ElectrostaticElectrostatics is the study of electric charge
which is not movingFirst person who did the experiment about
electrostatic is Thales(Greek)
He rub amber stone with wool then heapproached it to the feather and thefeather flew and patched to the amberstone for a moment.
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Atom
Atom is the smallestpart of an elementwhich still has thecharacteristic of the
element
Atom consists of smallerparticles which has itsown characteristic.
The particles are proton,neutron in core ofatom and electronwhich orbit around the
core of atom withcertain ath.
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Atom
Proton has positivecharge and electronhas negative chargewhile neutron has
neutral charge.
The amount of protonand electron chargeare same.
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AtomNeutral atom has the
same amount ofproton and electroncharge.
Atom which hasnegative electriccharge if the atomconsists of manyelectron then proton.
And atom which haspositive electriccharge if lack ofelectron.
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Atom Netral
Neutral atom has thesame amount ofproton and
electron.
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Atom Negatif
If an atom get theelectron fromanother atom so
the atom will beoverload ofelectron andbecome negative
charge.
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Atom Positif
If an atom lost itselectron so theatom will lack of
electron andbecome positivecharge.
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Menggosok dua jenis benda
Two certain objects if we rub themeach other so both of the will be hadelectric charge.
Example: balloon with wool
Glass with silkmica with wool
mica with silk
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Balon dengan Kain Wol
Balloon if we rub withwool so the electronis moving from the
wool to the balloon.So that the balloon
has negative chargeand wool has
positive charge.
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Kaca dengan kain sutra
If we rub glass withsilk, the electronmoves from glass to
the silk.So that the glass
becomes positivecharge and silk
becomes negativecharge.
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Menginduksi dengan BendaBermuatan Listrik
Beside byrubbing, anobject can begiven electriccharge byinducting withanother objectwhich has
electric charge.
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Sifat Muatan Listrik
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Sifat Muatan Listrik
Two electric charge object havecharacteristic:
- if the charge is same it willrepulsive each other.
- if the charge is different it willattractive each other
- neutral object always will beattracted by electric charge object.
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Hukum Coulomb
Repulsive Force or Attractive Forcebetween two electric charge objectwe call it Coulomb Force as the
award for Charles Augustin deCoulomb, French physicist that to bethe first people who research electricforce and formulate it
mathematically.
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Hukum Coulomb
Coulombs law can be formulated tobe:
F = kQ1.Q2
d
Notes: F =Coulomb Force (N)Q = Electric charge ( c )d = Distance between two
electric charge (m )
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Gaya Coulomb Sebanding denganmuatan listrik
Coulomb Forcebetween twocharge will be
change to bedirectlyproportional if
their charge ischange too.
Q1 F Q2
Q1 F Q2
F = FQ1.Q2Q1.Q2
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Gaya Coulomb berbanding terbalikdengan kuadrat jarak kedua muatan
Coulomb Forcealso will bechange if the
distance betweentwo charge arechange too.
dF
d
F
F=( ) Fd 2
d
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Elektroskop
Electroscope is adevice that is usedto detect the
existence of electriccharge in an object.
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Menentukan bendabermuatan listrik
To detect theexistence of electriccharge in an object
there is or not, wecan approach thatobject to the neutral
electroscope.
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Menentukan jenismuatan listrik suatu
benda
Jenis muatan listriksuatu benda dapatdilakukan dengan
cara mendekatkanbenda tersebut keelektroskop
bermuatan listrik
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Generator Van de Graaff
Generator van degraaff is agenerator whichproduce hugeelectrostatic.
Silinder logam
Silinder politen
Sabukkaret
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Terjadinya Petir
Lightning can behappened because leapof electrons fromnegative charge cloud to
the ground that haspositive charge.
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Penangkal Petir
Penangkal petir
merupakan alat pengarahpetir agar petir hanyamenyambar kepadanya,bukan ke bagianbangunan lainnya
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Electric Field (E) as a region of spacein which an electric chargeexperiences a force.
If an object that has electric charge is put ina space ,so in that space will has Electric
Field. If another object that has electric charge is
put in that space, So both of them will
experiences a force
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If the electric charge is same, the Force that
will be happened is Repulsive Force.
If the electric charge is different, the Force that will be
happened is Attractive Force.
Electric Field is shown by Electric Field
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Electric Field is shown by Electric FieldLines which the direction is away frompositive charges to negative charge.
The electric field is stronger closer to the
charge (the electric field lines are closer
together) and weaker further from the
charge (the electric field lines are furtherapart).
The magnitude of the electric field at a
point as the force per unit chargeE = F/q
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1.Calculate the electrostatic force between
two charges of +6nC and +1nC if they areseparated by a distance of 3mm.
2.Calculate the distance between two
charges of +4nC and
5nC if theelectrostatic force between them is0,005N.
3.Calculate the charge on two identicalspheres that are similarly charged if they areseparated by 6 mm and the electrostatic forcebetween them is 0,006N.
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4. Charge A = 6 nC, Charge B = 1 nCCalculate the electric field at Charge A, with
r = 3 mm.
5.Charge A = 4 nC, Charge B = -5 nC,
Calculate the electric field at Charge B
which influenced by Charge A. with r from
your answer no.2!!!!
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