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A Beam of Electrons Is Undeflected When It Passes Simultaneously

Question 39

Multiple Choice

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 * 104 m/s
C) 5 * 10-4 m/s
D) 2* 104 m/s
E) 5*104 m/s

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