A beam of electrons passes undeflected through two mutually perpendicular electric and magnetic fields. If the electric

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A beam of electrons passes undeflected through two mutually perpendicular electric and magnetic fields. If the electric field is cut off and the same magnetic field maintained, the electrons move in the magnetic field in a circular path of radius 1.14 cm. Determine the ratio of the electronic charge to the electron mass if E = 8.00 kV/m and the magnetic field has flux density 2.00 mT.

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