Only, the formula is B equals μ0 I divided by 2R. I had it written on a chit near my bed when I was winding coils for that little motor from old fan parts. But life says the real centre is never empty—for me, it was a small, wobbly circle of wire, my hands shaking, trying to get the turns even while thinking of Amma's glucose strips. The field felt strongest not at the centre, but in the stubborn hope that this might one day power something gentle for her.
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