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An electron with kinetic energy 228 eV is moving in a horizontal direction. The electron moves...

An electron with kinetic energy 228 eV is moving in a horizontal direction. The electron moves into a region where there is a uniform vertical electric field which has magnitude 3990 N/C. Find the smallest magnitude of a magnetic field that will cause the electron to continue to move horizontally. (1eV=1.6^10^(-19)J;mass of the electron=9.11*10^(-31)kg)

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SA 17 2 3、648 x10 x2 EN =0。8x1014 31 I6 399O 8.949 I0 6

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