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Let vec a= hat i+ hat j and vec b=2 hat...

Let ` vec a= hat i+ hat j` and `vec b=2 hat i- hat k ,` then the point of intersection of the lines ` vec rxx vec a= vec bxx vec a` and ` vec rxx vec b= vec axx vec b` is a. `(3,-1,1)` b. `(3,1,-1)` c. `(-3,1,1)` d. `(-3,-1,-1)`

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Which of the following is/are correct? (a)If vec a= hat i+ hat j and vec b=2 hat i- hat k then the point of intersection of the lines vec r x vec a = vec b x vec a and vec a x vec b = vec a x vec b is 3 vec i + vec j - veck (b)( vec r dot hat i )( hat i x vec r )+( vec r dot hat j )( hat j x vec r )+( vec r dot hat k )( hat k x vec r )= vec0 (c)If | vec a|=3,| vec b|=5,| vec c|=7 and vec a+ vec b+ vec c= vec0 then the angle between vec aa n d vec b is pi/3 (d)If the vectors vec a , vec b& vec c from the sides B C ,C A&A B respectively of a triangle A B C , then vec a x vec b = vec b x vec c x vec a

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