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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 |
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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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