Physics 2
Charging by friction
transferring charge by other object
Imbalance of electric charges
Static force
Greek word elektron means amber
Electricity
Produced static electricity when rubbed clothes
Amber
Contain an equal number of electrons
Neutral
Imbalance of numbers of electrons and protons
ions
Sum of the numbers
net charge
5 electrons and 6 protons
efield positive charged
25 protons and 26 electrons
efield negatively charged
Discovered negatively charged
Jj Thomson
Discovered positively charged as proton
Ernest Rutherford
Uncharges particles as neutrons
James Chadwick
Represented by the symbol "q
Electric charge
Charge of subatomic
e
Charge of the ion formula
1C/6.242 ×10¹⁸e
Like charges
Repel
unlike charges
attract
Materials that allow electrical charges
Conductors
Materials do not allow electrical charges
insulators
Objects that rubbed one onother
Charges by friction
Attract electrons itself
Electronegativity
Known charging by contact or object is touch
Charging by conduction
Conducting object rearrange
Charging by Induction
algebraic sum of all electric charges
Law of conversation of charge
electric charge comes a force known
Electrostatic forces
Columb's law formula
Fe=k [q1q2]/r²
Electrostatic force
Fe
Columb's constant 9×10⁹ nm²/C²
K
Magnitudes of the charges
q1q2
Distance between charges
r
Amount of electric forces and communicate to one onother
Electric Field
Electric field Formula
E = Fe/q0 or E= K q/r²
Test charge
q0
Introduce concept of fields
Michael Faraday
rate of the flow of the electric field
Electric flux
Will have an outward
Ef positive charges
Will have inward
Ef negative charges
no net electric flux
Zero charge
Electric flux formula
∅e= E(A) or E(A)cos∅
Nm²/C
0
N/C
E
m²
A
Mathematical relationship between charge
Gauss law
formulated the Gauss law
Carl Friedrich Gauss
Substance to store electrical energy
Permitivity
È0 C²/Nm²
8.85×10¹²