A wire of total length L carrying current I is wound into N identical circular turns. Which expression gives the field at their common centre?
Options

Question

A wire of total length L carrying current I is wound into N identical circular turns. Which expression gives the field at their common centre?

G1 Physics · Accepted Answer

The turn radius is r=L/(2πN). Therefore B=μ₀NI/(2r)=μ₀πN²I/L.