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Q.

Given A=3i^+4j^ and B=6i^+8j^, which of the following statement is correct?

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a

A×B=0

b

|A||B|=13

c

|A| = 15

d

A·B=48

answer is A.

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Detailed Solution

|A|=9+16=5and |B|=36+64=10.B=2A or B is parallel to A. Ratio of their coefficients are equal, so they are parallel or their cross product is zero.
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