Which detail from "Undercover Farmer” best shows that the narrator’s activism on behalf of farm animals changed practices in the community? I decided to show what I’d discovered to my friends so they could help me figure out some next steps. Three weeks later, two businesses had signed on, and two more said they’d think about it. I was assigned to feed the pigs, which was lucky because one of the things I’d read about was mistreatment of sows while they are pregnant. I got another friend to make posters and put them up on the bulletin boards at school.

the answer is a.

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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: