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B-Field inside thick coil (solenoid)

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T_guttata:
Hi everyone

The B-Field inside a coil is quite simple for L>>R, B=mu0*mur*N*I/L. It gets more complicated for thick coils. From high school I know that there is the law from Biot-Savart, but I have never actually used it.

How could you calculate the B-field inside a thick coil with non circular cross section (example: rectangular, a=1, b=5) at least approximatively (numerically)? I'm sure you could do it with matlab, but I don't know if this is the simplest way to do it.

Thanks for your help.

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