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What is the torque of the force vecF=(2h...

What is the torque of the force `vecF=(2hati+3hatj+4hatk)N` acting at the point `vecr=(2hati+3hatj+4hatk)m` about the origin? (Note: Tortue, `vectau=vecrxxvecF`)

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The correct Answer is:
90
`vecP=vecA+vecB+vecC=3hati-5hatk` and `vecQ=vecAxxvecB=|(hati,hatj,hatk),(1,2,3),(-1,1,4)|=5hati-7hatj+3hatk`
Angle between `vecP` & `vecQ` is given by `costheta=(vecP.vecQ)/(PQ)=(15-15)/(PQ)=0rArrtheta=90^(@)`
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