- #1
ikentrovik
- 6
- 0
Homework Statement
Please see attached image file
I understand everything in this problem except I don't know how they got (1/4) in the area of a coil.
Can someone explain this? I have googled it and I am not getting a clear answer.
I thought the area of a coil could be (pi(r)^2)L where l is the length. But wouldn't this be a cyclinder? How would I find it when the inner core of the cyclinder is missing?
Thank you