Avery long rod 5 mm in diameter has one end maintained at 100°c. the surface of the rod is exposed to ambient air at 25°c with a convection heat transfer coefficient of 100 w/m2.k. determine the heat lost from the rod if it is made of pure copper (k 398w/m. k), 2024 aluminum alloy (k = 180 w/m. k) and aisi 316 stainless steel (k = 14 w/m. k).

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:

snell's law

refractve index = sin incidence / sin refraction