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If vec(a).hati=4" then"(vecaxxhatj).(2ha...

If `vec(a).hati=4" then"(vecaxxhatj).(2hatj-3hatk)` is equal to

A

12

B

2

C

0

D

`-12`

Text Solution

Verified by Experts

The correct Answer is:
D
`(vec axx vecj)*(2hatj-3hatk)=veca*{hatjxx(2hatj-3hatk)}`
`= veca.{(-3(hatjxxhatk)}`
`=-3(veca-hati)`
`=-12 ( :. Veca*hati`=4 given)
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