Velocity Selector: A beam of electrons is accelerated through a potential difference of 1.0 kV before entering a velocity selector. If the magnetic field of the velocity selector has a magnitude of 0.010 T, what magnitude of the electric field is required if the electrons are not to be deflected as they pass through the velocity selector? (e = 1.60 × 10-19 C, melectron = 9.11 × 10-31 kg)
A. 5.9 × 103 V/m
B. 1.9 × 105 V/m
C. 6.0 × 105 V/m
D. 7.2 × 106 V/m
E. 1.1 × 105 V/m
Answer: B
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