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In a region, magnetic field along x-axis...

In a region, magnetic field along x-axis changes according to the graph given in fig.

If time period, pitch and radius of helix path are `T_0, P_0 and R_0`, respectively, and if the particle is projected at an angle `theta_0` with the positive x-axis towards positive y-axis in x-y plane, then
select the correct statement:

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