The dimensional formula for the modulus of rigidity is

  • [IIT 1982]
  • A

    $M{L^2}{T^{ - 2}}$

  • B

    $M{L^{ - 1}}{T^{ - 3}}$

  • C

    $M{L^{ - 2}}{T^{ - 2}}$

  • D

    $M{L^{ - 1}}{T^{ - 2}}$

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