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A current of $2\, amp$. flows in a long, straight wire of radius $2\, mm$. The intensity of magnetic field on the axis of the wire is
  • A$\left( {\frac{{{\mu _o}}}{\pi }} \right) \times {10^3}$ $Tesla$
  • B$\left( {\frac{{{\mu _o}}}{{2\pi }}} \right) \times {10^3}$ $Tesla$
  • C$\left( {\frac{{2{\mu _o}}}{\pi }} \right) \times {10^3}$ $Tesla$
  • D
    Zero
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