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A proton is moving through a vacuum chamber. It is initially moving horizontally to the west at a constant speed. It is observed to accelerate downward. Which field(s) could be responsible for this downward acceleration?

Select TWO answers.

A

A gravitational field in the upward direction.

B

An electric field in the downward direction.

C

A magnetic field in the southern direction.

D

A magnetic field in the northern direction.

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