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Question

If an unit vector (a^i+b^j) is perpendicular to (^i^j) then the value a and b are

A
12,12
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B
12,12
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C
12,12
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D
Can't be determined
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Solution

The correct options are
A 12,12
C 12,12
Two vectors A and B are perpendicular if A.B=0(a^i+b^j).(^i^j)=0
ab=0a=b
But a2+b2=1a=12,b=12 or a=12,b=12

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