A charged particle enters a medium where it is acted upon by a drag force proportional to its speed. Before the particle comes to a complete stop, it travels a distance of S=10 cm. If there is a magnetic field in the medium perpendicular to the velocity of the particle, then at the same initial speed it will stop at a distance of l1=6 cm from the point of entry into the medium. At what distance l2 from the point of entry into the medium would the particle stop if the field were half as strong?
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