Consider a vector 4î +3j another vector that is perpendicular to it is:
(a) -4î +3j
(b) 7k
(C)-4î -3j
(d) both B and C
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You have to take dot product from all the option as i can see only option B seems to be correct. You can directly come to conclusion by thinking that the vector given is in xy plane and the option B is in z plane so it is perpendicular to the vector.
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