What is the key idea expressed in these sentences? A. All South Africans wish to focus on their nation’s positive qualities rather than the negative ones. B. All South Africans share a connection to a beautiful land and have the opportunity for new beginnings. C. South Africans are hopeful and ready to be a source of light for the world. D. South Africans have avoided their painful history for far too long and need to begin a new.

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:

cause they were to dumb to get their college education to become a real   : )