IB Physics Electric Potential of Charge Distributions

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This sheet practices finding the electric potential of a system of point charges.

  1. Define electric potential at a point in an electric field.
  2. A point charge -q is placed at (-d/2,0) and a point charge +q is placed at (d/2,0). Find the electric potential at the point P that has coordinates (2d,0).
  3. In question 2 the point P is moved to a very large distance x from the origin along the x-axis. Show that the potential at P is approximately d k q/x2.