A Horizontally-Projected Beam of Electrons Travelling at 55 Km/s Travels

question 39

Multiple Choice

A horizontally-projected beam of electrons travelling at 55 km/s travels between two parallel plates between which there is an electric field.The beam travels exactly horizontally the whole time it is between the plates.What does this imply about the electric field between the plates?

• A) It is 0.
• B) It is 56 pV/m upward.
• C) It is 56 pV/m downward.
• D) It doesn't imply anything in particular.

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