Choose the one alternative that best completes the statement or answers the question. -A proton, moving north, enters a magnetic field. Because of this field, the proton curves downward. We may

Choose the one alternative that best completes the statement or answers the question.
-A proton, moving north, enters a magnetic field. Because of this field, the proton curves downward. We may conclude that the magnetic field must have a component
A) downward.
B) towards the west.
C) upward.
D) towards the east.
E) towards the north.

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