1.

The vector `vecP=ahati+ahatj+3hatj and vecQ=ahati-2hatj-hatk`, are perpendicular to each other. The positive value of a isA. 3B. 2C. 1D. zero

Answer» Correct Answer - A
`vecP.vecQ=0rArr(ahati+ahatj+3hatk).(ahati-2hatj-hatk)=0`
`a^(2)-2a-3=0rArr(a-3)(a+1)=0`
`a=3,-1`


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