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A beam of protons is directed in a straight line along the positive ?‑direction through a...

A beam of protons is directed in a straight line along the positive ?‑direction through a region of space in which there are crossed electric and magnetic fields. If the electric field magnitude is ?=410 V/m in the negative ?‑direction and the protons move at a constant speed of ?=1.5×105 m/s, what must the direction and magnitude of the magnetic field be in order for the beam of protons to continue undeflected along its straight-line trajectory?

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