The angle between A=i^+j^ and B=i^-j^ is [NCERT Exemplar]

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450

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answer is B.

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Detailed Solution

Given, A=i^+j^ and B=i^-j^We know that, A·B=|A‖B|cosθ⇒ (i^+j^)·(i^-j^)=(1+1)(1+1)cosθwhere, θ is the angle between A and B.⇒ cosθ=1-0+0-122=02=0⇒θ=90°

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