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A solenoid of $1.5$ $metre$ length and $4.0\, cm$ diameter posses $10$ $turn$ per $cm$. A current of $5$ $ampere$ is flowing through it. The magnetic induction at axis inside the solenoid is
  • A$2\pi \times {10^{ - 3}}\,tesla$
  • B$2\pi \times {10^{ - 5}}\,Tesla$
  • C$4\pi \times {10^{ - 2}}\,Gauss$
  • D$2\pi \times {10^{ - 5}}\,gauss$
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