The unit vector perpendicular to vectors a=3hati+hatj and =2hati-hatj-

1.	The unit vector perpendicular to vectors a=3hati+hatj and =2hati-hatj-5hatk is
Answer» `+-((HATI-3hatj+hatk))/(SQRT(11))` `+-(3hati+hatj)/(sqrt(11))` `+-((2hati-hatj-5hatk))/(sqrt(30))` NONE of these Solution :(a) `a=3hati+hatj` and `b=2hati-hatj-5hatk` `axxb=\|(hati, hatj, hatk),(3,1,0),(2,-1,-5)\|=(-5)hati-(-15-0)hatj+(-3-2)hatk` `=-5hati+15hatj-5hatk` `R=axxb=-5(hati-3hatj+hatk)` `HATR=(hati-3hatj+hatk)/(sqrt((1)^(2)+(-3)^(2)+(1)^(2)))=(hati-3hatj+hatk)/(sqrt(11))`

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