$A$ solenoid of $1.5 \ m$ length and $4.0 \ cm$ diameter possesses $10 \ turns/cm$. $A$ current of $5 \ A$ is flowing through it. The magnetic induction at the axis inside the solenoid is:

  • A
    $2\pi \times 10^{-3} \ T$
  • B
    $2\pi \times 10^{-5} \ T$
  • C
    $4\pi \times 10^{-2} \ G$
  • D
    $2\pi \times 10^{-5} \ G$

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