Two charged small spheres are a distance r apart and exert an electrostatic force f on each other. if the distance is halved to r/5 , the force exerted on each sphere will be..
a) 25f
b) 5f
c) f/5
d) f/25

The speed of light in a material is 0.50 c. what is the critical angle of a light ray at the interface between the material and a vacuum?

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Balloon a has charge q, and identical mass balloon b has charge 10q. you hang them from threads near each other. choose all of the statements with which you agree. check all that apply. a. a and b exert the same magnitude forces on each other. b. the force that a exerts on b is 10 times the force that b exerts on a. c. the angle between the thread supporting a and the vertical is < the angle between the thread supporting b and the vertical. d. the force that a exerts on b is 1/10 the force that b exerts on a.