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Consider a circular current-carrying loop of radius R in the x-y plane with centre at origin. Consider the line intergral ` ℑ (L) = |∫_(-L)^L B dl| ` taken along z-axis. Suppose we replace the circular coil by a square coil of sides R carrying the same

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Consider a circular current-carrying loop of radius R in the x-y plane with centre at origin. Consider the line intergral
` ℑ (L) = |∫_(-L)^L B dl| ` taken along z-axis.
Suppose we replace the circular coil by a square coil of sides R carrying the same current I. What can you say about ℑ(L ) and ℑ(∞) ?

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