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PHYSICS
ELECTROSTATICS
Short revision series
Coulomb’s law
 For charges in a vacuum
 F α Q1 Q2  F = k Q1 Q2
d2 d2
 k = 1/4πε0 = 9 x 109 Nm2 C-2
 ε0 = 8.854 x 10-12 Fm-1
 F = Q1 Q2
4πε0d2
 In a medium such as water F = Q1 Q2
4πεr2
ε = ε0 εr εr = relative permitivity
Intensity of an electrostatic field
 An electric field exerts a force on a charged
body. The intensity E of an electrostatic field
at any point is the force per unit charge
which it exerts at that point.
 E = F/Q
 If F = 1 Q1 Q2
4πε0 d2
 E = Q
4πε0d2 NC-1
Calculating electric field flux
 Ψ = E x area
 = Q x 4πr2 = Q
4πεr2 ε
 Eg calculate the flux of a charge 3nC in a
vacuum
 3 x 10-9
ε0
Potential of a charge
 What is the potential of a charge 3nC
positioned at 0.05m from a certain point in
vacuum?
solution
 Potential of a charge is the work done in
bringing a unit positive charge from infinity
to that point against action of the field
 V = Q
4πε0r2
= 3x 10-9 x 9 x109 = 54,000 V
0.05
end

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Electrostatics

  • 2. Coulomb’s law  For charges in a vacuum  F α Q1 Q2  F = k Q1 Q2 d2 d2  k = 1/4πε0 = 9 x 109 Nm2 C-2  ε0 = 8.854 x 10-12 Fm-1  F = Q1 Q2 4πε0d2  In a medium such as water F = Q1 Q2 4πεr2 ε = ε0 εr εr = relative permitivity
  • 3. Intensity of an electrostatic field  An electric field exerts a force on a charged body. The intensity E of an electrostatic field at any point is the force per unit charge which it exerts at that point.  E = F/Q  If F = 1 Q1 Q2 4πε0 d2  E = Q 4πε0d2 NC-1
  • 4. Calculating electric field flux  Ψ = E x area  = Q x 4πr2 = Q 4πεr2 ε  Eg calculate the flux of a charge 3nC in a vacuum  3 x 10-9 ε0
  • 5. Potential of a charge  What is the potential of a charge 3nC positioned at 0.05m from a certain point in vacuum?
  • 6. solution  Potential of a charge is the work done in bringing a unit positive charge from infinity to that point against action of the field  V = Q 4πε0r2 = 3x 10-9 x 9 x109 = 54,000 V 0.05
  • 7. end