Answer to Question #200813 in Physics for Yuu

Question

Consider two parallel plates of opposite charge separated by a distance of 0.016 m. The

electric field between the plates is uniform and has a magnitude of 6.00 x 104 V/m. The

plates are arranged such that the positively-charged plate is on top. All distances between

the plates are measured from the negatively-charged plate.

1) What is the magnitude of the potential difference between the two plates?

2) A -45.0 nC point charge is placed between the plates.

a) Toward which plate would the charge move?

b) What is the magnitude of the electric force experienced by the point charge?

c) If the point charge is placed exactly in the middle of the two plates, what is the

electric potential experienced by the point charge?

Answer 1

1) The magnitude of the potential difference between the two plates is

$$V=Ed=960\text V.$$

2) Put a -45.0 nC point charge between the plates.

a) The charge will move toward the positive plate.

b) The magnitude of the electric force experienced by the point charge is

$$F=Eq=2.7·10^{-3}\text N.$$

c) If the point charge is placed exactly in the middle of the two plates, the electric potential experienced by the point charge is 960V.