A Conducting Hollow Cylinder (Inner Radius = A,outer Radius = $\oint \mathrm { B } \cdot d \mathbf { s }$

question 110

Multiple Choice

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 $\oint \mathrm { B } \cdot d \mathbf { s }$ around a circular path (radius = 5.0 mm) centered on the axis of the cylinder and in a plane perpendicular to that axis?

• A)50 \(\mu\)T . m
• B)30 \(\mu\)T . m
• C)22 \(\mu\)T. m
• D)37 \(\mu\)T . m
• E)47\(\mu\)T . m

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