Many individuals find that it is mandatory in schools and universities to speak and learn English. 1. Learning English will help a person improve their work and study opportunities. 2. To enable an individual to integrate into society where English is spoken. 3. Individuals want to learn English. 4. A student spends time outside of the classroom creating a Wikispaces to help students find out more information about scholarships available to disadvantaged students.

1

Explanation:

Although nr. 2 and 3 are considered to be good reasons too, the first reason is the only one that really matters, due to the importance of improving work and study opportunities in a society where only high qualified - and fluent in English - persons count. 4 is interesting from a social point of view but  won´t help the individual much in his/her future career.

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: