Case Study (Charged particles): Two charged particles 1 and 2 have masses $m$ and $\frac{m}{2}$ and charges $-q$ and $+2q$ respectively. They are accelerated from rest through the same potential difference $V$, gaining kinetic energies $K_1$ and $K_2$, then enter a uniform magnetic field perpendicular to their velocities. Q: The ratio of their kinetic energies $\left(\dfrac{K_1}{K_2}\right)$ is:

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