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If vecA= 4hati+nhatj-2hatk and vecB=2hat...

If `vecA= 4hati+nhatj-2hatk and vecB=2hati+3hatj+hatk`, then findt the value of n so that `vecA bot vecB`.

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Dot product of two mutually perpendicular vectors is zero `vecA.vecB=0`
`(4hati+nhatj-2hatk).(2hati+3hatj+hatk)=0`
`implies (4xx2)+(nxx3)+(-2xx1)=0`
`implies 3n=6`
`impliesn=-2`
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