1. A proton (Q = +e) and an electron (Q = -e) are in a constant electric field created by oppositely charged plates. You release the proton from near the positive plate and the electron from near the negative plate. Which feels the larger electric force?
(a) The proton.
(b) The electron.
(c) Neither-there is no force.
(d) The magnitude of the force is the same for both and in the same direction.
(e) The magnitude of the force is the same for both but in opposite directions.
2. A battery establishes a voltage V on a parallel-plate capacitor. After the battery is disconnected, the distance between the plates is doubled without loss of charge. Accordingly, the capacitance_________ and the voltage between the plates _________.
(a) Increases; decreases.
(b) Decreases; increases.
(c) Increases; increases.
(d) Decreases; decreases.
(e) Stays the same; stays the same.