A frictionless circular wire of unit radius is…

Medium· Uniform Circular Motion (Expression for Centripetal Acceleration, Angular Displacement, Angular Speed, Time Period, and Frequency)· +4 / −1

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\left(\theta = \frac{\pi}{2}\right)

with identical uniform angular speeds in opposite directions, and meet again at point

B\left(\theta = -\frac{\pi}{2}\right)

. 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

\theta

? Figure: a circular wire with

A

at the top and

B

at the bottom; the two particles start from

A

and move in opposite directions along the circle, each reaching

B

. In the options,

\theta

runs from

\pi/2

(left end of the axis) to

-\pi/2

Circular Motion: RE-NEET 2026