As per your syllabus, if |A| = |B| = a and they make 60° between them, the magnitude of A + B is which?
A2 × a
Ba / 2 only
C1·a only
Da × √3
Answer & Solution
Correct answer: D. a × √3
syllabus eqn 3.24a: R = √(a² + a² + 2a² cos 60°) = √(2a² + a²) = √(3a²) = a√3.
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