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Q.

An infinitely long hollow conducting cylinder with radius R carries a uniform current along its surface.

Choose the correct representation of magnetic field (B) as a function of radial distance (r) from the axis of cylinder:

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a

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b

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c

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d

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answer is D.

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Detailed Solution

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As the current is on the surface, no magnetic field exist inside hollow cylinder. Outside we can apply Ampere's law and we find it is inversely proportional to r.

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An infinitely long hollow conducting cylinder with radius R carries a uniform current along its surface.Choose the correct representation of magnetic field (B) as a function of radial distance (r) from the axis of cylinder: