Consider a long solenoid that has n turns and is tightly wound using wire of diameter d. the radius of the solenoid is r. neglect fringe fields. (a) for a given current i, how big will the magnetic field in the solenoid be?
(b) a second solenoid is wound around the first one. the second solenoid has the same length as the first one, but uses wire that is twice as thick. what is the mutual inductance of the two solenoids? neglect fringe fields.

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.

Go to the bathroom and vape