In a region of space an electric field given by E=Ek and some unknown magnetic field exists. A particle of charge q is observed to move in the x direction at a constant velocity v = vi in this region. Which of the following is a possible value of the magnetic field? Assume that only electric and magnetic forces act on the particle.
a) B = - (EX) j
b) B = + (E/v) j
c) B = - (E/V) i
d) B = - (E/V) k
e) None
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