Question

A conducting hollow cylinder (inner radius = a, outer radius = b) carries a current of 40

A conducting hollow cylinder (inner radius = a, outer radius = b) carries a current of 40 A that is uniformly distributed over the cross section of the conductor. If a= 3.0 mm and b = 6.0 mm, what is the magnitude of the (line) integral ?B .dl around a circular path (radius = 5.0 mm) centered on the axis of the cylinder and in aplane perpendicular to that axis ??

ans . is 30 x 10^-6 T … I need explanation .. I couldn't get the same answer

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