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JEE Advanced2012PhysicsMagnetic Effects of CurrentActual

An infinitely long hollow conducting cylinder with inner radius R / 2 and outer radius R carries a uniform current density along its length. The magnitude of the magnetic field, | B | as a function of the radial distance r from the axis is best represented by

Correct answer

3

Step-by-step solution

For r R, B= ₀ i 2 r i.e., B 1 r array Hence graph (d) correctly depicts | B | versus r graph.

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