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`        WHY  DOES THE RESULTANT VECTOR AFTER CROSS PRODUCT  PERPENDICULAR TO THE VECTORS BEFORE CROSS PRODUCT??`
7 years ago

147 Points
```										Dear araku
It is the difinition of vector .suppose three unit vector along the 3 axis ,
i ,j,k
according to definition  iXj =k  ,jXk =i  ,kXi =j  and iXi=0 ,jXj=0, kXk=0
now consider any general vector a =a1i + a2j + a3k
and  b = b1i + b2j + b3k
now find aXb=c = (a1i + a2j + a3k)X( b1i + b2j + b3k)
= (a1b2-a2b1)k + (a2b3-a3b2)i + (a3b1 - a1b3)j
now find a.c
it will come that a.c=0
so vector c is perpendicular to vector a
Please feel free to post as many doubts on our discussion forum as you can.If you find any question Difficult to understand - post it here and we will get you the answer and detailed  solution very  quickly. We are all IITians and here to help you in your IIT JEE preparation.All the best. Regards,Askiitians ExpertsBadiuddin

```
7 years ago
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