How to solve for the NUMBER OF TURNS in a magnetic coil..?

Hello.. i would like to ask if somebody can answer my question.. i need to know how many turns do we make in our coil.. We have a magnetic wire #32.. And we have a magnet with a strength of 150mT+ but just below 200mT(millitesla) Our magnet has a shape of a semi-circle a bit [...]

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