A current i is uniformly distributed ove...

A current i is uniformly distributed over the cross section of a long hollow cylinderical wire of inner radius `R_1` and outer radius `R_2`. Magnetic field B varies with distance r form the axis of the cylinder is

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A long straight wire of a circular cross-section (radius a) carries a steady current I and the current I is uniformly distributed across this cross-section. Which of the following plots represents the variation of magnitude of magnetic field B with distance r from the centre of the wire?

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The figure shows a long coaxial cable in which a current I flows down through the inner cylinder of radius a and the same current flows back up through the outer cylinder of radius 2a. The cylinders are insulated from each other and the current is uniformly distributed over the area of the cross-section in each cylinder. The strength of the magnetic field at a distance 3a//2 from the axis of the cable is

NTA MOCK TESTS-NTA NEET SET 33-PHYSICS

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