Question

:
If |A+B| = |A| = |B| then angle between
A and B will be-
[AIPMT-2001]​

Answer 1

Answer :

60°

Solution :

⟶ |A - B| = √{|A|² + |B|² - 2|A||B|cos θ} = |A| = |B|

⟶ √{|A|² + |A|² - 2|A|²cos θ} = |A|

⟶ 2|A|² - 2|A|² cos θ= |A|²

cos θ = 1/2

θ = 60°

Answer 2

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