A=3^i+4^j. Find a vector perpendicular to →A in the plane of →A
A
^k
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B
−3^i−4^j
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C
4^j−3^i
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D
4^i−3^j
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Solution
The correct option is D4^i−3^j If ax^i+ay^j is any vector then another vector perpendicular to it in same plane is ay^i−ax^j or −ay^i+ax^j So, required vector =4^i−3^j or −4^i+3^j