A particle having a negative charge of 1.9 10-6 C experiences an upward force of 3 N when placed at a certain location in space. What is the magnitude and direction of the electric field at that point

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.