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

Question

$F\left( {\widehat i - \widehat j} \right)$

$ - F\left( {\widehat i + \widehat j} \right)$

$F\left( {\widehat i + \widehat j} \right)$

$ - F\left( {\widehat i - \widehat j} \right)$

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