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A wire of length `L metre ` , carrying a current `I `ampere is bent in the form of a circle . The magnitude of its magnetic moment is …………. ` MKS units ` .

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Correct Answer - B::D
Wire of length `L` is bent in the form of a circle . Then perimeter of the circle
` 2pir = L ` rArr ` r= (L)/(2 pi)
:. Area of the circle ` = pir^(2) = (piL^(2))/( 4 pi^(2)) = ( L^(2))/(4 pi)`
Magnetic moment of a loop in which current `i` flows is given by
` M = iA = (iL^(2))/(4 pi)`
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