Q1. The paper dielectric in the paper-and-foil capacitor is 8.00×10-2 {rm mm} thick. Its dielectric constant is 2.5, and its dielectric strength is 50 {rm MV}/ {rm m}. Assume that the geometry is that of a parallel-plate capacitor, with the metal foil serving as plates.

Q2. An electron with initial velocity v0 = 1.20 × 10^5 m/s enters a region 1cm long where it is electrically accelerated. It emerges with velocity v = 5.87 × 10^5 m/s. What is its acceleration, assumed constant? (Such a process occurs in conventional television sets.)