You observe a charged particle accelerate across a vacuum chamber from lower vol

Question

You observe a charged particle accelerate across a vacuum chamber from lower voltage to higher voltage. Which combination of statements are the most accurate conclusions you can draw?

(A) The particle is neutral
(B) The particle is positively charged
(C) The particle is negatively charged
(D) The particle is charged, but the sign is unknown
(E) The particle's potential energy increased
(F) The particle's potential energy decreased
(G) The particle's potential energy remained unchanged
(H) The particle was accelerated along the direction of the electric field
(I) The particle was accelerated opposite the direction of the electric field
(J) There is no electric field across the vacuum chamber
(K) There may not be an electric field across the vacuum chamber

Explanation / Answer

As it is moving to higher voltage, the particle must be negative charged. Just take the case of electrons flowing in a battery and the flow of conventional current. <C>

The potential energy is Increased. U=-q(V2-V1)= e(V2-V1)= eV2-eV1 and V2>V1. <E>

Electric field(E) = (V2-V1)/d; Force = -e(V2-V1)/d ; acc = -eE; Hence opposite Direction. <I>

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