# Homework Help: Mutual Inductance

1. Apr 28, 2013

### danilorj

1. The problem statement, all variables and given/known data
Derive an expression for the mutual inductance ,L12, for the case of the figure, assuming a current distribution:
J$_{2}$(x)= F$_{2}$(x), h1<x<h2
or
I$_{2}$(x)= ∫$^{h_2}_{h_1}$ F$_{2}$(x)w$_{2}$dx

2. Relevant equations

L$_{12}$(x)=∅$_{12}$(x)/ i$_{2}$(x)

3. The attempt at a solution
In fact I don't know why the problem gives this current distribution. For me the final expression of the mutual inductance does not depend on current. And I don't know either the behavior of the flux lines. The final expression for the mutual I found is L$_{12}$=μ$_{0}$*(h$_{2}$-h$_{1}$)w$_{1}$ / (g+h$_{2}$)

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• ###### problema1.png
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2. Apr 28, 2013

### rude man

No idea what this picture represents. Coils? You're right, the mutual inductance between two wired arrangements is not a function of current unless paramagnetics are involved.

3. Apr 28, 2013

### danilorj

The problem is not clear at all on specifying what really this picture means. But I guess the region that is in bege is the magnetic core whose permeability is infinity. And 1 and 2 are cross section of rectangular conductors embedded in the core. Then, for somehow, it makes a currrent density to go through a conductor 2 and it will generate a magnetic flux across conductor 1, for this magnetic flux that is mutual inductance associated. That is what a problem is asking for.