Two forces −→F1=2^i−5^j−6^k and −→F2=−^i+2^j−^k are acting on a body at a point (1,1,0) and (0,1,2) respectively. Find the torque acting on the body about the point (−1,0,1).
A
−14^i+10^j−9^k
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B
−11^i+10^j−12^k
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C
−3^i+3^k
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D
−14^i−10^j−9^k
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Solution
The correct option is A−14^i+10^j−9^k
From the diagram, →r1=(1−(−1))^i+(1−0)^j+(0−1)^k →r1=2^i+^j−^k........(I)