Donna stretched a spring to increase its length. nearby in an electrical device, a positive charge attracted a negative charge. which statement is true about the spring and the negative charge?

a. they both experienced contact forces.
b. they both experienced non-contact forces.
c. the spring experienced a contact force and the charge experienced a non-contact force.
d. the spring experienced a non-contact force and the charge experienced a contact force.

Four objects each with charge +2.0×10−7c are located at the corners of a square whose sides are 2.0 m long. part a what quantities can be determined using this information? check all that apply. the electric force on a charged object placed at the center of the square. the mass of each object. the total electric potential energy of the system consisting of the four charged objects. part b find the electric force on a charged object placed at the center of the square.