Choose the one alternative that best completes the statement or answers the question. -At a particular instant, a proton moves toward the east in a uniform magnetic field that is directed

Choose the one alternative that best completes the statement or answers the question.
-At a particular instant, a proton moves toward the east in a uniform magnetic field that is directed straight downward. The magnetic force that acts on it is
A) downward.
B) zero.
C) toward the south.
D) toward the north.
E) upward.

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