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Magnetics question

2004 · Shift 0 · Q128
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Magnetics question

2004 · Shift 0 · Q128

JEE MainPhysicsMagneticsMCQ+4 / −1
A current iii ampere flows along an infinitely long straight thin walled tube, then the magnetic induction at any point inside the tube is
  1. A
    μ04π,2ir{{{\mu _0}} \over {4\pi }},{{2i} \over r}4πμ0​​,r2i​ tesla
  2. B
    zero
  3. C
    infinite
  4. D
    2ir{{2i} \over r}r2i​ tesla
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