ELECTROSTATICS

Equipotential

Electric Force And Coulomb's Law

Electric Field , E

Electric Potential Energy , V

Electric Charges , Q

Positive charge, p = +1.6 x 10^-19 C

Negative charge , e = -1.6 x 10^-19 C

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Charge cannot be created nor destroyed, it can only be transferred from one material to another
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Quantization of charge : Q = ne

Coulomb's Law states that the electric force , F between two charges seperated by a distance , r is

i) inversely proportional to the square of the separation , r between two charges

ii) and directly proportional to the product of the magnitudes of the charges , Q1 and Q2.

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A region in which and electric force will act on a charge when the charge is placed in the region.


Definition : The electric force acting per unit charge.
Unit : NC^-1


E = F/q
E = kQ/r^2

  1. Number of lines per unit area determine the strength of electric field.
  1. Do not intersect each other
  1. Represented by electric field lines

E is large when the field lines are close together

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Charge in a uniform electric field

F = qE

F = ma

Definiton : Work done per unit charge , V=W/q
Unit : J C^-1 or Volt (V)

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A surface on which all points are at the same potential.
The potential difference between any two points on an equipotential surface is zero.

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Alyaa Nadirah , T19