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A torque meter is calibrated to reference standards of mass, length and time each with 5% accuracy. After calibration, the measured torque with this torque meter will have net accuracy of :

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15%

25%

75%

answer is B.

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Detailed Solution

Dimensional formula for Torque

$[τ] = [{ML}^{2} T^{- 2}]$

Now

Percentage error in torque $= % τ = % M + 2 (% L) + 2 (% T)$

$\begin{array}{l} % τ = 25 % \end{array}$

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