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(r.i) (rxxi) + (r.j)(rxxx\j) + (r.k)(rxx...

` (r.i) (rxxi) + (r.j)(rxxx\j) + (r.k)(rxxk)` is equal to

A

0

B

r

C

3r

D

none

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The correct Answer is:
A
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ML KHANNA-ADDITION AND MULTIPLICATION OF VECTORS -Problem Set (2) (MULTIPLE CHOICE QUESTIONS)
  1. Let veca, vecb, vec c form sides BC, CA and AB respectively of a tria...

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  2. The vector r is equal to

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  3. (r.i) (rxxi) + (r.j)(rxxx\j) + (r.k)(rxxk) is equal to

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  4. If a + 2b + 3c= 0, then axxb + bxxc+c xxa is equal to

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  5. If veca=4i+6jand vecb=3j+6k vector form of the component of a along b ...

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  6. Let vec a=2 hat i- hat j+ hat k , vec b= hat i+2 hat j= hat ka n d ve...

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  7. Let vec u , vec va n d vec w be such that | vec u|=1,| vec v|=2a n d|...

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  8. a =hati +hatj-hatk, b = hati -2hatj +hatk, c = hati -hatj-hatk, then a...

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  9. Projection of the vector 2i+3j-2k on the vector i+2j+3k is

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  10. If a = 2i+j+2k, b=5i-3j+k, then orthogonal projection vector of a and ...

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  11. Given two vectors a = 2i -3j+6k, b=2i+2j-k and p = ("the projection of...

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  12. Show that the vector of magnitude sqrt(51) which makes equal anges wit...

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  13. In a parallelopiped the ratio of the sum of the squares on the four d...

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  14. A line makes angles alpha,beta,gammaa n ddelta with the diagonals of a...

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  15. If vec a , vec ba n d vec c are unit vectors, then | vec a- vec b|^2+...

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  16. The modulus of the sum of three mutually perpendicular unit vectors is

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  17. If a + b + c = 0, |a| = 3, |b| = 5, |c| = 7, then the angle between a ...

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  18. If a, b , c are vectors such that c = a + b and a. b = 0 , then

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  19. If a, b, c are three unit vectors such that a+b+c=0. Where 0 is null v...

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  20. Let vec u , vec v and vec w be vector such vec u+ vec v+ vec w= ...

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