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NEET Physics · Easy

Basic Mathematics & Vectors: Vector Addition MCQ

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Vector AdditionEasyQuestion 5106

Question

If two equal vectors of magnitude A are inclined at angle θ to each other, the magnitude of their resultant is:
  1. A
    2A cosθ
  2. B
    2A cos(θ/2)
    Correct
  3. C
    A cos(θ/2)
  4. D
    2A sinθ

Correct answer

2A cos(θ/2)

Explanation

For two equal vectors of magnitude A at angle θ: R = A√(2+2cosθ) = A√(4cos²(θ/2)) = 2A cos(θ/2).

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