Question

5. A vector perpendicular to (4i – 3j)may be :
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Answer 1

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