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For more information, please see full course syllabus of AP Physics B
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Electric Potential

  • To move a particle with charge q in an electric field, from point A to point B, an external agent needs to do work; the amount of work done is equal to Ub –Ua, where Ub is the electric potential energy at A, and Ub is the electric potential energy at B.
  • In a uniform electric field, the potential difference between 2 points separated by a vector d is the dot product E.d; if you move along the field lines, the potential drops.
  • The electric potential of a point charge Q at a distance r is V = kQ/r.
  • A surface perpendicular to the electric field lines is an equipotential surface.
  • The potential energy of a system of 2 point charges Q and Q’ separated by a distance r, is U = kQQ’/r.

Electric Potential

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

  • Intro 0:00
  • Electric Potential Difference 0:11
    • Example :Earth and Object
    • Work Done
    • Work Done Against Field
    • Difference in Potential, Between Points
    • Va=Vb+Ed
  • Potential Difference in a Constant Electric Field 18:03
    • Force Applied Along the Path
    • Work Done Along the Path
    • Potential Difference is Same
  • Point Charge 28:50
    • Electric Field of Point Charge is Radial
    • Force Applied is Perpendicular to Displacement
    • Independent of Path
  • Collection of Point Charge 43:56
    • Electric Potential at Charge Points
  • Equipotentail Surface 46:33
    • Plane Perpendicular to Field
    • Force Perpendicular to Surface
  • Potential Energy: System of a Two Point Charges 54:17
    • Work Done in Moving the Charge to Infinity
  • Potential Energy: System of Point Charges 57:05
  • Extra Example 1: Electric Potential of Particle
  • Extra Example 2: Particle Fired at Other Particle