Physics

Problem

91. A parallel-plate capacitor has charge

+Q

on one plate and charge

-Q

on the other. The plates, each of area

A

, are a distance

d

apart and are separated by a vacuum. A single proton of charge

+e

, released from rest at the surface of the positively charged plate, will arrive at the other plate with kinetic energy proportional to (A)

\frac{e d Q}{A}

(B)

\frac{Q^{2}}{e A d}

(C)

\frac{A e Q}{d}

(D)

\frac{Q}{e d}

(E)

\frac{e Q^{2}}{A d}

(A)

\frac{e d Q}{A}

(B)

\frac{Q^{2}}{e A d}

(C)

\frac{A e Q}{d}

(D)

\frac{Q}{e d}

(E)

\frac{e Q^{2}}{A d}