As per your syllabus, if |A| = |B| = a and they make 90° between them, the magnitude of A + B is which?
Aa × √2
B2 × a
C0 m only
D1·a only
Answer & Solution
Correct answer: A. a × √2
syllabus eqn 3.24a: cos 90° = 0, so R = √(a² + a²) = a√2.
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