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Homework Statement
The attached picture shows a spool coil on a iron core with an air gap measuring 2.5mm. The spool is coiled by 0.5mm^{2} with rho _{cu} = 0.0175 Ωmm^{2} /m. The average winding diameter for the spool is 3.18cm.
Compute the magnetic flux in the spool.
Homework Equations
The Attempt at a Solution
Using the equation: phi = I * N / R_{m}, I still miss I, and I have no idea how to compute it. R_{m} is the reluctance which I can get from a BH characteristic  if that applies to this problem.
My first questions are these I guess: Is this the correct formula? If yes, how to I compute I?
Any feedback and help is as always greatly appreciated. Thanks.
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