Everyone knows that water is important. who doesn’t like to drink a cool glass of water after a long day? but some people don’t seem to worry about polluting the local water supply. they should! i like water, and so should everyone else.
what change would most improve this introductory paragraph?
providing additional examples of the importance of water
emphasizing further the foolishness of not caring about water
providing summary evidence of the bad impacts of water pollution
emphasizing that water pollution is as bad as air pollution

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation:

alrigt gdy