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NDA2013MathematicsVector AlgebraActual

If the magnitude of a b equals to a b , then which one of the following is correct?

Options

  1. Aa = b
  2. BThe angle between a and b is 45^
  3. Ca is parallel to b
  4. Da is perpendicular to b

Correct answer

B. The angle between a and b is 45^

Step-by-step solution

aligned & | a b |=| a b | & | a || b | =| a || b | & =1 = 4 aligned

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