An electron of mass m and charge -e moves at a constant speed v along a circular path of radius r in a region of magnetic field B. In the same region, particle X with mass M moves at a constant speed 3v along a circular path with radius 2r. The direction of revolution of the particles is indicated in the figure. What is magnitude and sign of the charge of particle X? B 2r r Electron Particle X OA. +e OB. - e 2 M OC. M OD. + e
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