- #1
demon_samuel
- 3
- 0
Dear all,
i met a problem that i couldn't get the on axis field of a finite solenoid that integrating from a thin shell solenoid equation.
The thin shell equation link:
http://www.netdenizen.com/emagnet/solenoids/thinsolenoid.htm
And the on axis finite solenoid equation link:
http://www.netdenizen.com/emagnet/solenoids/solenoidonaxis.htm
If i was right, the integral of (a/sqrt (a*a+r*r)) dr should be a*ln(r+sqrt(r*r+a*a)), if so i couldn't figure out how to get the (r2-r1) term in the second link equation.
Thank you for your attention
Samuel
i met a problem that i couldn't get the on axis field of a finite solenoid that integrating from a thin shell solenoid equation.
The thin shell equation link:
http://www.netdenizen.com/emagnet/solenoids/thinsolenoid.htm
And the on axis finite solenoid equation link:
http://www.netdenizen.com/emagnet/solenoids/solenoidonaxis.htm
If i was right, the integral of (a/sqrt (a*a+r*r)) dr should be a*ln(r+sqrt(r*r+a*a)), if so i couldn't figure out how to get the (r2-r1) term in the second link equation.
Thank you for your attention
Samuel