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An electron is initially moving in the positive x-direction, when suddenly a uniform magnetic field is turned on. The electron is observed to be detected in the negative y-direction. In which direction is the magnetic field?
a) Positive y-direction.
b) Negative y-direction.
c) Negative x-direction .
d) Positive x-direction.
e) Positive z-direction.
f) Negative z-direction.