The force $F$ on a sphere of radius $a$ moving in a medium with velocity $v$ is given by $F = 6\pi \eta av$. The dimensions of $\eta$ are

  • A
    $M L^{-1} T^{-1}$
  • B
    $M T^{-1}$
  • C
    $M L T^{-2}$
  • D
    $M L^{-3}$

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