- #1
sarahgarden
- 3
- 0
Homework Statement
A long, straight copper pipe of inner diameter 16mm and outer diameter 24mm carries a current of 100A. Calculate the magnetic flux density at distances i)5mm, ii)10mm and iii)15mm from its axis?
Answer : i)0, ii)9*10^-4T iii) 13.3*10^-4T
Homework Equations
I thought it would be B=mu_0*I/(2pi)r
It does in fact say this in my notes.
Also I get i) resulting in 0, if it's taken from line through middle of pipe (it irked me then that ii) had a value) but axis is used here and in my textbook differently - to mean off the surface of the pipe.
Your help is much appreciated.