An electric field of 50kV/m is perpendicular to a magnetic field 0.25T. What is the velocity of a charge whose initial of motion is perpendicular to both fields and which passes through the fields undeflected?
a. 3×10^3m/s
b. 2×10^5m/s
c. 4×10^7m/s
d. 5×10^4m/s
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