2). A beam of electrons is undeflected when it passes simultaneously through an electric field of 10 N/C perpendicular to its path and a magnetic field of 2 × 10^-4 T perpendicular both to its path and to the electric field. The speed of the electrons is approximately a. 2 × 10^-4 m/s. b. 1 × 10^4 m/s. c. 5 × 10^-4 m/s. d. 2 × 10^4 m/s. e. 5 × 10^4 m/s.
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