Physics · Magnetic Effects of Current
A long straight wire of circular cross-section (radius a) carries a steady current I distributed uniformly across its cross-section. The magnetic field magnitude is:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Zero in the region r a
- 2Inversely proportional to r in the region r a
- 3Directly proportional to r in the region r a✓
- 4Uniform in the region r a
Correct answer
Directly proportional to r in the region r a
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