Place the field meter at different distances from the magnet and note the value of magnetic field strength at
each location. How does magnetic field strength vary as
you move away from the bar magnet?

the displacement produced by the body.  

the amount of force subjected to the body.  

the angle between the direction of force and displacement

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.