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A force of $- F \hat{k}$ acts on O, the origin of the coordinate system. The torque about the point (1, –1) is

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$F (\hat{i} - \hat{j})$

$- F (\hat{i} + \hat{j})$

$F (\hat{i} + \hat{j})$

$- F (\hat{i} - \hat{j})$

answer is D.

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Detailed Solution

Torque= $\vec{r} \times \vec{F} = (- \hat{i} + \hat{j}) \times (- F \hat{k}) = - (F \hat{j} + F \hat{i})$

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