In the vicinity of point charge, we place a 0.2μC charge so that a force of 5×10^−5 applied on it due to the charge q. Find the electric field produced by this unknown charge?

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.

3. dark matter

empty space could also be a simple vacuum