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What is the magnitude of the moment of t...

What is the magnitude of the moment of the couple consisting of the force `vec(F)=3 hat(i)+2hat(j)-hat(k)` acting through the point `hat(i)-hat(j)+hat(k) and -vec(F)` acting through the point `2hat(i)-3hat(j)-hat(k)`?

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The correct Answer is:
`=5sqrt(5)` units.
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