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JEE Main Physics question

PhysicsMotion in a PlaneJEE Main

Two vectors and are inclined at an angle . If the vectors (their magnitudes) are interchanged, the resultant turns through an angle . Which of the following relations is true?

Answer: (A)

Solution

Writing each vector as (its magnitude)(a fixed unit vector along its own original direction), and working through the geometry of the resultant

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Question ID VK-157926