what is toroid and formulas
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The toroid is a useful device used in everything from tape heads to tokamaks. Magnetic field = permeability x turn density x current. For a solenoid of radius r = m with N = turns, the turn density is n=N/(2πr)= turns/m.
In science, a formula is a concise way of expressing information symbolically, as in a mathematical formula or a chemical formula. The informal use of the term formula in science refers to the general construct of a relationship between given quantities.
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