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The physical quantities not having same dimensions are

  1. torque and work
  2. momentum and Planck's constant
  3. stress and Young's modulus
  4. speed and\({\left( {{\mu _0}{\varepsilon _0}} \right)^{ - 1/2}}\)
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Correct option is 2) momentum and Planck's constant

Momentum = mv = \([{M{L}{T^{ - 1}}}]\)

Planck's constant, h = \({E \over v}={[{M{L^2}{T^{ - 2}]}} \over {[{T^{ - 1}}]}}= [{M{L^2}{T^{ - 1}}}]\)

So Momentum and Planck's constant do not have same dimensions

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