A thick, straight current-carrying cable of radius 'R' carries a current 'I' uniformly distributed across its cross-section. Which statement correctly describes the variation of the magnetic field B(r) due to the cable with the distance 'r' from its central axis?

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Physics · Magnetic Effects of Current

Verified Solution4 OptionsUpdated: October 2026👁️1 View

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B is directly proportional to r for r R

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Answer 1

B is constant for r R

Answer 2

B is zero for r R

Answer 3

B is inversely proportional to r for r R

Answer 4

B is directly proportional to r for r R

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