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Q.

Magnitude of torque is maximum when

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a

radius vector is perpendicular to force vector

b

radius vector is parallel to force vector

c

Angle between radius vector and force vector is $45 °$

d

Angle between radius vector and force vector is $60 °$

answer is A.

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Detailed Solution

$\bar{τ} = \bar{r} \times \bar{F} = r F \sin θ,$

If $θ = 90 °$ , then $| \bar{τ} |$ is maximum

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