PHYSICS · Subjective · A Level · Physics · Fields and their consequences · Fields and their consequences
Problem
An isolated capacitor carries a fixed charge Q. For one capacitor a dielectric with κ=5 fills the gap; for an otherwise identical capacitor a dielectric with κ=2 fills the gap. The dielectrics are completely removed without allowing charge to flow off the plates. Calculate the ratio of the work required to remove the κ=5 slab to the work required to remove the κ=2 slab, W5/W2.