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If theta is the angle between any two ve...

If `theta` is the angle between any two vectors `vec a` and `vec b` , then `|vec a. vec b| = | vec a xx vec b|`, when `theta` is equal to

A

0

B

`(pi)/(4)`

C

`(pi)/(2)`

D

`pi`

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The correct Answer is:
B
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NCERT TAMIL-VECTOR ALGEBRA-Miscellaneous Exercise on chapter 10
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  3. A girl walks 4 km towards west, then she walks 3 km in a direction 30^...

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  8. Show that the points A(1, -2, -8) B (5, 0, -2) and C(11, 3, 7) are col...

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  11. Show that the direction cosines of a vector equally inclined to the ax...

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  12. Let veca=hati+4hatj+2hatk,vecb=3hati-2hatj+7hatkandvecc=2hati-hatj+4ha...

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  13. Thescalar product of the vector hat i + hat j + hat k with a unit vect...

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  14. If veca,vecb,vecc are mutually perpendicular vectors of equal magnitu...

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  15. Prove that (veca+vecb)*(veca+vecb)=|veca|^(2)+|vecb|^(2), if and only...

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  16. If theta is the angle between two vectors vecaandvecb then veca*vecbge...

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  17. Let vecaandvecb be two unit vectors and theta is the angle between the...

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  18. The value of hati.(hatjxxhatk)+hatj.(hatkxxhati)+hatk.(hatjxxhati) ...

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  19. If theta is the angle between any two vectors vec a and vec b , then |...

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