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JEE Mathematics · Medium

Vectors: Angle between vectors MCQ

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Angle between vectorsMediumQuestion 260007

Question

The angle between vectors a⃗ = î + ĵ and b⃗ = î − ĵ is:
  1. A
    90°
    Correct
  2. B
    0°
  3. C
    60°
  4. D
    45°

Correct answer

90°

Explanation

a⃗ · b⃗ = (1)(1) + (1)(−1) = 0. Since dot product = 0, the vectors are perpendicular (90°).

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