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A long straight wire of radius a carries a steady current i. The current is uniformly distributed across its cross section. The ratio of the magnetic field at a/2 and 2a is
  • a)
    1/2
  • b)
    1/4
  • c)
    4
  • d)
    1
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
A long straight wire of radius a carries a steady current i. The curre...
Here, current is uniformly distributed across the crosssection of the wire, therefore, current enclosed in the amperean path formed at a distance 
 where I is total current
∴ Magnetic field at P1 is
Now, magnetic field at point P2,
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Community Answer
A long straight wire of radius a carries a steady current i. The curre...
Correct ans is 4,i.e(c)
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A long straight wire of radius a carries a steady current i. The current is uniformly distributed across its cross section. The ratio of the magnetic field at a/2 and 2a isa)1/2b)1/4c)4d)1Correct answer is option 'D'. Can you explain this answer?
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