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To produce a couple of 20 N m on a disc ...

To produce a couple of 20 N m on a disc of radius 10 cm, what is the force to be applied.

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Radius = 10 cm `rArr` diameter `= 20 cm = 0.2 m`
Given ` tau = 20 N m rArr tau = F xx r`
` F = tau div r rArr F = 20 div 0.2 = 100 N`
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