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For the value of a, vecA = 2hati +a hat...

For the value of a, `vecA = 2hati +a hatj +hatk` is prependicular to `vecB = 4hati - 2hatj- 2hatk`?

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Verified by Experts

The correct Answer is:
3
`vecA and vecB` will be perpendicular to each other if
`" "vecA. vecB=0`
`(2hati + ahatj + hatk)(4 hati- 2hatj -2hatk)=0`
`" "8-2a-2=0`
`" "a = 3`
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