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The angle between the two vector -2hati+...

The angle between the two vector `-2hati+3hatj+hatk` and `hati+2hatj-4hatk`is

A

`0^(@)`

B

`90^(@)`

C

`180^(@)`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
b
`cos theta =(-2 hat I + 3 hat j+hatk)-(hat i+2 hatj-4 hatk)/(sqrt(4+9+1)sqrt(1+4+16))=(-2+6-4)/(sqrt(14)/sqrt(21))=0 rarr theta =90^(@)`
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