The earth's magnetic field was flipped by $180^{\circ}$ a million years ago. This flip was relatively rapid and took $10^5 \,yrs$. Then, the average change in orientation per year during the flip was closest to ............ $s$

  • [KVPY 2020]
  • A

    $1$

  • B

    $5$

  • C

    $10$

  • D

    $30$

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  • [IIT 1970]