Two balloons are charged with an identical quantity and type of charge: -4 nc. they are held apart at a separation distance of 70 cm. determine the magnitude of the electrical force of repulsion between them.

Explanation:

The electrostatic force between the two balloons is given by:

where

is the Coulomb's constant

is the charge on each balloon

is the distance between the balloons

Substituting into the formula, we find

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.