A fixed-length wire carrying constant current I is rewound from one circular turn of radius R into N identical circular turns. Which statements are correct?
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Question

A fixed-length wire carrying constant current I is rewound from one circular turn of radius R into N identical circular turns. Which statements are correct?

G1 Physics · Accepted Answer

The wire-length constraint gives r=R/N, and B=μ₀NI/(2r), leading to an overall factor N².