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Let vecaandvecb be two unit vectors and ...

Let `vecaandvecb` be two unit vectors and `theta` is the angle between them Then `veca+vecb` is a unit vector if

A

`theta=(pi)/(4)`

B

`theta=(pi)/(3)`

C

`theta=(pi)/(2)`

D

`theta=(2pi)/(3)`

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The correct Answer is:
D
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NCERT TELUGU-VECTOR ALGEBRA-Miscellaneous Exercise on chapter 10
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  5. Find the value of x for which x(hati+hatj+hatk) is a unit vector.

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  6. Find a vector of magnitude 5 units and parallel to the resultant of th...

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  7. If veca=hati+hatj+hatk,vecb=2hatj-hatj+3hatkandvecc=hati-2hatj+hatk, ...

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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. The scalar product of the vector hati+hatj+hatk with a unit vector alo...

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

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

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  16. The value of hati.(hatjxxhatk)+hatj*(hatixxhatk)+hatk*(hatixxhatj) is

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  17. If theta is the angle between any two vectors vecaandvecb, then |veca*...

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