As per your syllabus, the magnitude of the resultant of two vectors A and B at angle θ is given by which expression?
A√(A² + B² + 2AB cos θ)
B√(A + B)
C√(A² + B² - 2AB cos θ)
D√(A² + B²)
Answer & Solution
Correct answer: A. √(A² + B² + 2AB cos θ)
syllabus eqn 3.24a (parallelogram law): R = √(A² + B² + 2AB cos θ), where θ is angle between A and B.
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