A configuration of charges with a positive charge and a negative charge is called a dipole.

Sample questions

1. For this dipole configuration, what is the direction of the electric field at point A?

   A. up

   B. down

   C. right

   D. left

   E. none of the above

2. For this dipole configuration, what is the direction of the electric field at point B?

   A. up

   B. down

   C. right

   D. left

   E. none of the above

3. For this dipole configuration, what is the direction of the electric field at point C?

   A. up

   B. down

   C. right

   D. left

   E. none of the above

This interactive PhET simulation enables you to view the electric field caused by systems of charges. The magnitude of the field here is depicted by the color of the field vectors, not their lengths.

This interactive simulation from compadre.org calculates and illustrates the trajectories of positive test charges placed in electric fields created by a system of charged particles.

Electric field simulation

This interactive electric field simulator allows you to view the electric field of various charge configurations, for example, this dipole configuration.

Sample problem

Find the electric field due to this dipole at point P, a distance r away from the origin on the x-axis.

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