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ELECTROSTATICS, V=kQ/r, NURAINSYAFIQAH BINTI MOHD YUSOFF
A20SC0277
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ELECTROSTATICS
COULOMB'S LAW
The electric force between two charges is proportional to the product of the charges and inversely proportional to the distance between them
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Unit of charge: coulomb,C
k=8.99X10^9 N-m^2/C^2
1uC=106-6 C
e=1.602X10^-19 C
-Coulomb's Law describs the force between 2 charges when they are at rest
-Coulomb's law gives the electrostatic force
GAUSS LAW
The net number of field lines through the surface is proportional to the charge enclosed,and also to the flux
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Gaussian surface
can be any shape you wish to make it,but most useful surface is one that mimics the symmetry of the problem at hand
often be a sphere,cylinder or some other symmetrical form
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ELECTRIC POTENTIAL
The electric potential at a distance r from a single point charge Q can be derived from the expression for its electric field( EkQ/r^2 )
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The potential V decreases with the first power of distance,whereas the electric field decrease as the square of the distance
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