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If `vecA=4veci-2hatj+4hatk` and `vecB=-4hati+2hatj+alphahatk` are perpendicular to each other then find value of `(alpha)` ? |
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Answer» `because vecA & vecB` are perpendicular to each other `therefore vecA. vecB=0rArr (4hati-2hatj+4hatk).(-4hati+2hatj+alpha hatk)=0` `rArr-16-4+4alpha=0rArr alpha=5` |
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