What is the kinetic energy of an electron that passes undeviated through perpendicular electric and magnetic fields if E = 4.0 kV/m and B = 8.0 mT?
A. 0.65 eV
B. 0.71 eV
C. 0.84 eV
D. 0.54 eV
E. 1.4 eV
Answer: B
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