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If `vecA=2hati+4hatj` and `vecB=6hati+8hatj` and A and B are the magnitudes of `vecA` and `vecB`, then which of the following is not true?A. `vecAxx vecB= vec0`B. `(A)/(B) = (1)/(2)`C. `vecA*vecB= 48`D. `A= 5` |
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Answer» Correct Answer - 3 `vecA= 3hati+4hatj, vecB= 6hati+8hatj` `vecAxx vecB= |{:(hati,,hatj,,hatk),(3,,4,,0), (6,,8,,0):}| = 0hati+ 0hatj+ 0hatk=vec0` `A= sqrt(3^(2)+ 4^(2))= 5 & B =sqrt(6^(2)+ 8^(2))= 10` `vecA*vecB= (3hati+4hatj)*(6hati+8hatj) = 18+ 32 =50` |
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