A flat capacitor, between the plates of which an electric field of intensity E = 200 V/m is created, is placed in a magnetic field so that the field lines of the fields are mutually perpendicular. What should the magnetic field induction H be so that an electron with an initial energy T = 1 keV, flying into the space between the capacitor plates perpendicular to the magnetic field lines, does not change the direction of speed?
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