Задача 30504.

The coil, wound on a non-magnetic cylindrical frame, has N = 250 turns and an inductance L1 = 36 mH. To increase the coil inductance to L2 = 100 mH, the coil winding was removed and replaced with a winding of thinner wire so that the length of the coil remained the same. How many turns were in the coil after rewinding?

Detailed solution with a brief record of the conditions, formulas and laws used in the solution, derivation of the calculation formula and answer.
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