Two Large Parallel Conducting Plates Are Separated by a Distance

question 21

Multiple Choice

Two large parallel conducting plates are separated by a distance d, placed in a vacuum, and connected to a source of potential difference V.An oxygen ion, with charge 2e, starts from rest on the surface of one plate and accelerates to the other.If e denotes the magnitude of the electron charge, the final kinetic energy of this ion is:

• A)eV/2
• B)eV/d
• C)eVd
• D)Vd/e
• E)2eV