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Q.

The torque of the force F→ = (2i^−3j^+4k^)   N  acting  at  the  point  r→ = (3i^+2j^+3k^) m  about  the  origin  be

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a

6i^−6j^+12k^

b

17i^−6j^−13k^

c

−6i^+6j^−12k^

d

−17i^+6j^+13k^

answer is B.

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Detailed Solution

τ→ = r→ ×F→ = i^j^k^3232−34= [2×4−(3×−3)]i^+[2×3−3×4]j^+[3×−3−2×2]k^ = 17i^−6j^ −13k^
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