The terminal velocity of a small sphere of radius $a$ in a viscous liquid is proportional to

  • [AIEEE 2012]
  • [AIIMS 2004]
  • A

    $a^2$

  • B

    $a^3$

  • C

    $a$

  • D

    $a^{-1}$

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  • [JEE MAIN 2014]