It might be 1.25T but only on the microsopic level which is not implicated by this formula. Now, we sure don't expect that such miscroscopic coil would extend it's field anywhere outside it's microscopic dimensions. For example, if we enter just 1 turn, current of 1mA but we decrease the thickness down to 1 millionth of a cm, that is, 0,0000001 cm, we supposedly get a field of ~1,25T. Second and key point is that as we decrease the length of the coil field is supposedly getting proportionally stronger. It is not the same if coil has 1cm radius or 10cm, of course, bigger the radius less flux density for same field strength. Not to calculate manually we can use this online calculatorįirst of all this formula does not take into account the diameter of the coil. Formula for magnetic field strength H = amp x turns / length is well known, but it leads to misleading results.
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