Two identical tiny spheres have the same electric charge. If their separation is doubled, the force each exerts on the other will be (a) half.
(b) double.
(c) four times larger.
(d) one-quarter as large.
(e) unchanged.

The scalar triple product computes the magnitude m of the moment of a force vector f about a specified line. it is m = (r × f) · n, where r is the position vector from the line to the point of application of the force and n is a unit vector in the direction of the line. use matlab to compute the magnitude m for the case where f = [12, −5, 4] n, r = [−3, 5, 2] m, and n = [6, 5, −7].