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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.

AP Physics B