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Question

A=3^i+4^j. Find a vector perpendicular to A in the plane of A

A
^k
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B
3^i4^j
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C
4^j3^i
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D
4^i3^j
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Solution

The correct option is D 4^i3^j
If ax^i+ay^j is any vector then another vector perpendicular to it in same plane is ay^iax^j or ay^i+ax^j
So, required vector =4^i3^j or 4^i+3^j

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