ELECTROSTATICS
COULOMB'S LAW (ELECTRIC FORCE) 
CHARLES COULOMB DEDUCED:
- electric force (F) is directly proportional with the product of the two charges (q1,q2)
- electric force (F) is universally proportional with the square of the distances between the two charge (r)
ELECTRIC FIELDS
- electric field is a region around a charged particle or object in which a force would be exerted on other charged particle or object.
- electric fields line are always pointed out from positive charge and point in to negative charge.
click to edit
Electric field patterns
Electric field in a conductor
- the electric field inside a conductor is zero in a static situation.
- the electric field outside the conductor is always perpendicular to the surface on the conductor.
Electric field in a conductor : Faraday's cage
- discovered in 1830 the internal of a static cage or Mesh shield cause the electron to shift, thus neutralizing the shield in the interior of the cage.
- this concept is used to protect people or object from lightning strike.
some of these application are
elevator and other rooms frame famously faraday's effect
protect airplane passengers compartiment
Eletric field between two parallel plates
the uniform electric between two plates: E = V/D
- D : distances between the two plates in meter m
- V : potential difference between the 2 plates, v
ELECTRIC POTENTIAL ENERGY
- Electric potential energy of a charge = the energy of a charge has due to its position relative to others charge
- Electric potential energy of a system = the energy owned by a system due to its position of all charge relative to their surroundings charges in the system
Electric potential
has the symbol of V and units of volts (v)
- K = coulomb's constant.
- Q = charge on Q, including the sign +/- , in coulomb.
- r = distance between point p and charge Q, in meter.
