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An electron and a proton enter a region of uniform magnetic field at the same point...

An electron and a proton enter a region of uniform magnetic field at the same point (not at the same time) with the same velocity, and exit in the direction opposite to which they entered the region. If the distance between the point of entry and exit of the electron is d, what is the distance (in terms of d) between the point of entry and exit for the proton?

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