"The magnetic field at the center of a 50-turn coil of radius 15 cm is 0.60mT. find the current in the coil."(adsbygoogle = window.adsbygoogle || []).push({});

N=50, r = .15m, B = 6.0 * 10^-4 T, magnetic permeability = 4 * pi * 10^-7.

B = (mag.per. * N * I)/ L

However, I don't have L, which is the length. I do have r, the radius, but it's not in the equation... How do i solve this?

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# Find the current in the coil

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