Consider a vector F=4^i−3^j. Another vector which is perpendicular to →F is:
A
4^i+3^j
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B
6^i
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C
7^k
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D
3^i−4^j
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Solution
The correct option is C7^k The vector perpendicular to the i & j plane would be along the unit vector k. Another vector in i & j plane can be perpendicular to →F (3ˆi+4ˆj)⊥(4ˆi−3ˆj) But, from the options only 7ˆk⊥(4ˆi−3ˆj)