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The resultant of two vectors A and B gets rotated through 90 degree. If one of these vectors is reversed, then these vectors must Be equal Have equal magnitudes Have magnitudes in ratio Underroot 2:1 be parallell Please answer with explanation.

The resultant of two vectors A and B gets rotated through 90 degree. If one of these vectors is reversed, then these vectors must 
  1. Be equal
  2. Have equal magnitudes
  3. Have magnitudes in ratio Underroot 2:1
  4. be parallell
Please answer with explanation.

Grade:12th pass

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