Which explains how winds cause surface currents? a. friction between the blowing air and the water drags the water along and creates surface currents. b. high-pressure air from the blowing winds presses down on the surface and creates currents. c. winds evaporate water from the surface and increase the salt content. as the salty water sinks, it creates surface currents. d. winds cool the surface water. as the water sinks, it creates surface currents.

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: