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If the veactors veca, vecb and vecc form...

If the veactors `veca, vecb and vecc` form the sides BC,CA and AB respectively of triangle ABC, then :

A

`vec a . vec b + vec b . vec c + vec . vec a=0

B

`vec xx vec b = vec b xx vec c = vec c xx vec a`

C

`vec a . vec b = vec b . vec c = vec c. vec a`

D

`vec a xx vec b + vec b xx vec c+ vec c xx vec a = vec 0`

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The correct Answer is:
B
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HIMALAYA PUBLICATION-VECTORS AND THEIR APPLICATIONS-QUESTION BANK
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  12. A particle acted by constant forces 4 hati + hatj - 3 hatk and 3 hati ...

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  13. If veca, vecb, vecc are non-coplanar vectors and lamda is a real numbe...

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  14. Let vec a, vec b and vec c be three non zero vectors such that no two ...

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  15. If vec u, vec nu, vec w be such that |vec u| =1, |vec nu| = 2, |vec w|...

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  16. Let veca,vecb and vec c be three non zero vectors such that no two o...

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  17. If vec a = i-k, vec b = i+j+(1-x)k and vec c = yi+xj+(1+x-y)k then [ve...

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  18. If a, b and c be distinct non negative numbers. If the vectors ai+aj+c...

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  19. For any vector vec a, the value of (vec a xx i)^(2) + (vec a xx j)^(2)...

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  20. If C is the mid-point of AB and P is an7y pont outside AB, then :

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