A frictionless circular wire of unit radius is fixed on the horizontal plane. Two-point particles of unit mass start moving simultaneously from point A ( = 2 ) with identical uniform angular speeds in opposite directions, and meet again at point B ( =- 2 ) . During this time, which of the following figures schematically represent the magnitude of the total linear momentum P of the system, as a function of ?

1. A. Graph (1)
2. B. Graph (2)
3. C. Graph (3)
4. D. Graph (4)

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