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A copper wire of length l metre is bent ...

A copper wire of length l metre is bent to form a circular loop. If I amp current flows through the loop, find out the magnitude of magnetic moment of the loop.
Or, Write down the Biot-Savart law. Show its vector form.

Text Solution

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Circumference `= 2pi r = l or, r = (l)/(2pi)m`
So, area of the loop, A = `pi r^(2) = pi((l)/(2pi))^(2) = (l^(2))/(4pi)m^(2)`
` therefore` Magnitude of magnetic moment, `P_(m) = iA = (il^(2))/(4pi) Acdot m^(2)`
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