5. A vector perpendicular to (4i – 3j)may be :
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Answer:
their dot product must be equal to 0 .
Let the vector perpendicular to given vector is
ai+bj to satisy the above condition-
(4i−3j).(ai+bj)=0
(4a−3b)=0
hence 4a=3b
i.e, a/b=3/4
for minimum integer value a = 3 and b = 4
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