Posted by Edwin on Monday, April 5, 2010 at 9:41am.
Three charges of 5 x 10^(6) C are placed on the vertices of an equilateral triangle of 10cm. Calculate force on each charge.

physics  bobpursley, Monday, April 5, 2010 at 11:01am
Add the two forces as Vectors. You can use arguments of symmetry to simplify it.
F=kQQ/s^2 * 2 cos30, the direction is along the vertex bisector.