If a third charge q3= +10 nC is placed at point b, compute the total potential energy of the system.

Use the example below as reference

An electric dipole consists of point charge q, = +12 nC and 92 = -12 nC placed 10.0 cm apart. (a) Compute the electric potential at point . (b) if a third charge 93 = +10 nC is placed at point b, compute the total potential energy of the system. SOLUTION a) At point a, we have ri = 0.060 m, and r2 = 0.040 m, h qi 91 92 V = + ATTEO 4TEO r 1'2 13.0 cm 13.0 cm 12 x 10-9c -12 x 10 9C + 4TEO 0.060 m 0.040 m = 1800 V + (-2700 V) 42 6.0 4.0 K cm -900 V