An isolated parallel-plate capacitor initially has plate separation
PHYSICS · Single correct · AP · Physics 2: Algebra-based · Electric Force Field and Potential · Electric Force Field and Potential
Problem
An isolated parallel-plate capacitor initially has plate separation d, charge magnitude Q, and contains a dielectric of constant κ. The separation is quickly reduced to d/3 without allowing any charge to leave the plates. Which of the following describes how the magnitude of the electric field E between the plates and the potential difference ΔV across the plates change, if at all?
(a) E is unchanged and ΔV becomes three times larger.
(b) E is unchanged and ΔV becomes one-third its original value.
(c) E is unchanged and ΔV is unchanged.
(d) E becomes three times larger and ΔV is unchanged.