Someone by giving me a story prompt for an adventure story

Every itme when I am stuck on the writing topic, I make it up. It is easier to write about the topic you like. Here what I came up with:

I came home from school and found a strange box at my front door…

I got a letter in the mail saying I won round the world ticket!

The other night I dreamt I was a stray dog…

I was riding my bike when all of a sudden…

answer: yes, ive read this book! now whats the problem ?

explanation:

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: