1.

Three vectors `vecA,vecB` and `vecC` add up to zero.Find which is false.A. `(vecAxxvecB)xxvecC` is not zero unless `vecB,vecC` are parallelB. `(vecAxxvecB).vecC` is not zero unless `vecB,vecC` are parallelC. If `vecA,vecB,vecC` define a plane, `(vecAxxvecB)xxvecC` is in that planeD. `(vecAxxvecB).vecC =|vecA||vecB||vecC|rarrC^(2)=A^(2)+B^(2)`

Answer» Correct Answer - B::D
2) `(AxxB). C=(BxxA).C=0` Whatever be the positions of `A,B` and `C`.if `B||C`, then `BxxC=0`, then `(BxxC)xxC=0.3`
4) If `C^(2)=A^(2)+B^(2)`, then angles between `A` and `B` is `90^(@)`


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