Practice question

**Dielectric polarization** when slab inserted, bound charges appear reducing effective field, capacitance increases by factor K, potential difference for constant charge V = Q/C decreases, for constant voltage charge increases. Dielectric constant K = ε/ε₀ >1, e.g., K≈5 for glass. In electrostatic equilibrium, a conductor with a cavity shields the external region from charges inside the cavity. The charge inside induces an equal and opposite charge on the inner surface of the cavity, and the conductor adjusts its outer surface charge distribution to ensure the field inside the conductor (outside the cavity) is zero. The field outside depends only on the net charge on the