Phy 1.4 S2

• Electric potential at a point, V is defined as the work done per unit charge to bring a test charge from infinity to that point in an electric field produced by a source point charge, Q.
• Electric potential, V is a scalar quantity and the unit is JC^-1 or Volt (V) or NC^-1 m.
• V = -W/q epsilon
• V = kQ/r
• Electric Potential Energy, U = -qV
• Potential difference between two points is the work done per unit charge to bring a positive point charge from point A to point B in an electric field.
• V = Ed
• U = Q¹Q²/(4pi x epsilon x r)
• Distribution of charge

  1. Discrete distribution of charge 2. Continuous distribution of charge
• Discrete distribution of charge : 1. Made up of individual point particles. 2. To identify the individual charges.
• Continuous distribution of charge 1. Cannot identify individual charges.
• Continuous distribution

  1. Line charges distribution
  2. Surface area charges distribution
  3. Volume charges distribution