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A cylindrical wire of radius R is carrying uniformly distributed current i over its cross-section. If a circular loop of radius r is taken as amperian loop, then the variation value of  B·d over this loop with radius ‘r” of loop will be best represented by

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detailed solution

Correct option is B

Current within radius rR,∮B→·dℓ→=μ0Iin=μ0I→ Constant

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