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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