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If hati,hatj,hatk are the unit vectors a...

If `hati,hatj,hatk` are the unit vectors and a is a vector such that `a xxr = hatj` then a.r is

A

`-1`

B

0

C

1

D

None

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The correct Answer is:
D
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BITSAT GUIDE-VECTOR ALGEBRA -BITSAT Archives
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  13. If the position vectors of A, B and C are respectively 2hati-hatj+hatk...

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  14. Let vecV = 2hati +hatj - hatk and vecW= hati + 3hatk . if vecU is a u...

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