If the magnitude of sum of two vectors is equal to the magnitude of difference of the two vectors, the angle…

If the magnitude of sum of two vectors is equal to the magnitude of difference of the two vectors, the angle between these vectors is:
  1. 0o
  2. 90°
  3. 45°
  4. 180°

Solution

A→+B→=A→-B→

A→2+B→2+2A→B→ cosθ=A→2+B→2-2A→B→ cosθ

4A→B→ cosθ=0
cosθ=0
θ=90°

Asked in: NEET 2016 (Phase 1)

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