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Three paticles, an electron (e), a proto...

Three paticles, an electron (e), a proton (p) and a helium atom (He) are moving in circular paths with constant speeds in the x-y plane in a region where a uniform magnetic field B exists along z-axis. The times taken by e, p and He inside the field to complete one revolution are `t_e, t_p and t_He` respectively. Then,

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