A thick current cable of radius R carries current I uniformly distributed across its cross-section. The variation of magnetic field B(r) due to the ca - Physics MCQ NEET 2021 2026 | ExamTest.live

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A thick current cable of radius R carries current I uniformly distributed across its cross-section. The variation of magnetic field B (r) due to the cable with the distance r from the axis of the cable is represented by:

Solution & Step-by-step Explanation

Using Ampere's Law:Inside the cable (r < R): B = \frac{μ _{0} I r}{2 π R ^{2}} \Rightarrow B \propto r .Outside the cable (r > R): B = \frac{μ _{0} I}{2 π r} \Rightarrow B \propto \frac{1}{r} .The correct representation is a linear increase followed by a hyperbolic decrease.

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A thick current cable of radius R carries current I uniformly distributed across its cross-section. The variation of magnetic field B (r) due to the cable with the distance r from the axis of the cable is represented by:

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