Describe the relationshlp between the force between two magnetic poles and the distance of separation.
The magnetic force is directly proportional to the square of the distance of separation.
The magnetic force is inversely proportional to the distance of separation.
The magnetic force is inversely proportional to the square of the distance of separation.
The magnetic force is directly proportional to the distance of separation.

Neptune is the eighth planet from the sun. it was the first planet to get its existence predicted by  mathematical calculations  before it was actually seen through a telescope on sept. 23, 1846. irregularities in the orbit of  uranus  led french astronomer alexis bouvard to suggest that the gravitational pull from another celestial body might be responsible. german astronomer johann galle then relied on subsequent calculations to   spot neptune via telescope. previously, astronomer galileo galilei sketched the planet, but he mistook it for a star due to its slow motion. in accordance with all the other planets seen in the sky, this new world was given a name from greek and roman mythology — neptune, the roman god of the sea.

Because its reliable.   there is no pollution  the chances of a radiation leak is low

Since the pully is a simple machine so the mechanical advantage is a 1

I’m not sure about this question