(Next three questions) Suppose two charged plates are floating in empty space, d-20 cm apart and parallel to each other, and each plate has area A-17 m². Suddenly, the world's best ultimate frisbee player throws a dielectric slab with thickness 0.2 m (same as the capacitor spacing d) perfectly between the two plates, causing the voltage difference across the plates to change. Then he challenges you to do the same thing with a conducting slab with a different thickness, which would knock out and replace the dielectric between the plates. Assume unless otherwise stated that none of these materials touch.

(Next three questions) Suppose two charged plates are floating in empty space, d-20 cm apart and parallel to each other, and each plate has area A-17 m². Suddenly, the world's best ultimate frisbee player throws a dielectric slab with thickness 0.2 m (same as the capacitor spacing d) perfectly between the two plates, causing the voltage difference across the plates to change. Then he challenges you to do the same thing with a conducting slab with a different thickness, which would knock out and replace the dielectric between the plates. Assume unless otherwise stated that none of these materials touch.