In May 2011, Josh Ferrin bought his family's first home. Soon after, he made a discovery. Ferrin was in his attic. He spotted a strange metal box and opened it. Ferrin could not believe what he saw inside. There were rolls of bills
tied together with string. In all, he found more than $40,000 in his attic. He thought about what he could do with
all that money. He could pay his bills. He could also buy things he never dreamed that he could afford. However,
he decided to give back the money to its rightful owners.
Do It!
Ferrin was
A wounded
B surprised
C angry
D forgotten

ferrin was surprised according to the story

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: