The same wire of length L carrying current I is first shaped into a square and then into a circle. What is μcircle/μsquare?
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The same wire of length L carrying current I is first shaped into a square and then into a circle. What is μcircle/μsquare?

G1 Physics · Accepted Answer

Square area=L²/16. Circle radius=L/(2π), so circle area=L²/(4π). Their moment ratio equals area ratio=[L²/(4π)]/[L²/16]=4/π.