• Unit vectors of the electrostatic field surrounding 3 point charges are depicted in the above animation.
  • Unit vectors are shown pointing away from the sampling points (marked in magenta) on 2D plane containing the charges.
• The charges --- red, blue, and the mobile one --- have the same magnitude and two of them have the same sign.
  • Can you figure out which one has the negative charge?
• What aspect of the animation is unrealistic?
  • Hint: immediate action-at-a-distance vs delayed (or retarded) response...

Feel free to download the source file and modify the javascript code to add more effects.