Coulomb's Law for Three Aligned Charges

graphics

2D

3D

range of charge 3

20

charge 1

17

charge 2

14

charge 3

20

Charges 1 and 2 are fixed in place.

F

13

is the force of charge 1 on charge 3, and

F

23

is the force of charge 2 on charge 3. The blue point shows the place where the two forces balance.