Determinar la magnitud de la fuerza que actúa sobre una car- ga de prueba de 2 x 10-C al situarse en un punto en que
la intensidad del campo eléctrico tiene una magnitud de 6 X
10' N/C.

A1-lb collar is attached to a spring and slides without friction along a circular rod in a vertical plane. the spring has an undeformed length of 5 in. and a constant k =25 lb/ft. knowing that the collar is released from being held at a determine, the speed of the collar and the normal force between the collar and the rod as the collar passes through b.