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Q.

A force of - Fk^   acts on O, the origin of the coordinate system. The torque about the point (1, –1) is

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a

F(i⇀ +j→)

b

-F(i→-j )→

c

F(i→-j→)

d

-F(i⇀ +j→)

answer is D.

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Detailed Solution

      τ→=r→xF→ =  i→F + j→F  

                      given     r ⇀ =0-1i^+0--1j^=-i^+j^  and     F→ =- FK→

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