Physics · Magnetic Effects of Current
A long straight wire with a circular cross-section of radius R carries a steady current I. The current I is uniformly distributed across this cross-section. The variation of the magnetic field B due to current I with distance r (where r < R) from its center is proportional to:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 11r
- 21r2
- 3r✓
- 4r2
Correct answer
r
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