Let a force \( \overrightarrow{\mathrm{F}}= \)-Fk acts on the origin of Cartesian frame of refer...

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Let a force \( \overrightarrow{\mathrm{F}}= \)-Fk acts on the origin of Cartesian frame of reference. The moment of force about a point \( (1,-1) \) will be
(A) \( F(\hat{i}-\hat{j}) \)
(B) \( F(\hat{i}+\hat{j}) \)
(C) \( -F(\hat{i}-\hat{j}) \)
(D) \( -F(\hat{i}+\hat{j}) \)
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