A flat circular coil which has 𝑁 turns each of diameter d carries a current 𝐼. If 𝜇0 is the permeability of free space, what is the expression of magnetic field 𝐵 at the center of the coil?
The magnetic field 𝐵 at the center of the coil is
"B=\\frac{\\mu_0NI}{2R}"
Here "d=2R" is the diameter.
"B=\\frac{\\mu_0NI}{d}"
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