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Question: Answered & Verified by Expert
Figure shows a long straight wire of a circular cross-section (radius a) carrying steady current I. The current I is uniformly distributed across this cross-section. Calculate the magnetic field in the region r > a

ChemistryMagnetic Effects of CurrentNEET
Options:
  • A $B~=~\left( \frac{{{\mu }_{0}}I}{2\pi {{a}^{2}}} \right)4r$
  • B $B~=~\left( \frac{{{\mu }_{0}}I}{2\pi {{a}^{2}}} \right)3r$
  • C $B~=~\left( \frac{{{\mu }_{0}}I}{2\pi {{a}^{2}}} \right)r$
  • D $B~=~\left( \frac{{{\mu }_{0}}I}{2\pi {{a}^{2}}} \right)2r$
Solution:
1283 Upvotes Verified Answer
The correct answer is: $B~=~\left( \frac{{{\mu }_{0}}I}{2\pi {{a}^{2}}} \right)r$
Correct Option is : (C)
$B~=~\left( \frac{{{\mu }_{0}}I}{2\pi {{a}^{2}}} \right)r$

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