A trip through magnetic fields

A positively charged particle, which was initially moving in the \(+y\) direction on the \(xy\)-plane, passes through points P, Q and R, as shown above. The magnetic field intensities of area I and area II are \(2B\) and \(B,\) respectively, and P and Q have the same distance from the origin O. If it takes \(T_0\) for the charged particle to move from P to Q, how long will it take for it to move from Q to R?

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