Two 3.0-g aluminum foil balls hang from 1.6-m-long threads that are suspended from the same point at the top. The charge on each ball is +5.0×10−9C. Determine the angle between the threads. Assume the gravitational force is much greater than the electrostatic force.

b.

explanation:

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.

there are no contact forces mentioned on the list of choices that you've provided.