- #36
TFM
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Is you rearrange the formula, that would be:
[tex] I_{f_encl} = 2\pi sH [/tex]
?
TFM
[tex] I_{f_encl} = 2\pi sH [/tex]
?
TFM
TFM said:Is this the rigght equation to use for magnetization:
[tex] M = \chi_M H [/tex]
?
If so, the value for H is:
[tex] H = \frac{I_{f_{encl}}}{2\pi r} [/tex]
Giving:
[tex] M = \chi_M (\frac{I_{f_{encl}}}{2\pi r}) [/tex]
?
TFM
(1) A current I flowing up the inner cylinder and (2) A current I flowing down the inner cylinder
TFM said:Do you mean up the inner and down the outer?
My first answer would be 0, since the current going up would cancel the one going down, but this would surely mean that there would be no magnetic field?
So I am wondering if since it is the same current, would the answer be (d) 2I
TFM said:So:
[tex] \vec{H} = \frac{I}{2\pi r}\hat{\phi} [/tex]
[tex] \vec{M} = \chi_M \frac{I}{2\pi r} \hat{\phi} [/tex]
?
TFM
This ^^^ is just a an ordinary cross product not a curl...you can find [itex]\hat{\phi} \times \hat{s}[/itex] using the right hand-rule.TFM said:The formulas I need for this question I believe are:
[tex] j_{ind} = M \times \hat{S} [/tex]
for surface bound currents and:
[tex] J_{ind} = \nabla \times M [/tex]
for volume.
Hence the reason for the directional vectors (Thanks)
So M vector is:
[tex] \vec{M} = \chi_M \frac{I}{2\pi r} \hat{\phi} [/tex]
so this means that for the Surface bound currents:
[tex] j_{ind} = (\chi_M \frac{I}{2\pi r} \hat{\phi}) \times \hat{S} [/tex]
I'm not sure the curl matrix for thus one?
and for Volume bound currents:
[tex] J_{ind} = \nabla \times (\chi_M \frac{I}{2\pi r} \hat{\phi}) [/tex]
With the curl Matrix:
S [tex] \phi [/tex] Z
d/ds d/d[tex] \phi [/tex] d/dZ
0 M 0
Latex doesn't do Matrices (not that I could see)
Does this look right?
?
TFM