We report new developments in electromagnetic scattering theory in which charge-induced resonances in nanoparticles result from interaction with electromagnetic radiation. The net surface charge can be a significant factor in many systems, for instance, colloids of metallic particles. Among colloidal particles at liquid interfaces, charged nanoparticles are a fertile subject of new technological concepts and can be decisive in the development of new devices and novel technologies in the nanosciences, such as optical attenuators, modulators, and switches that can be turned on or off through the application of charge. For electrically charged particles, the resonant excitation of surface modes is governed by exc ess charges deposited on the particle surface. Charge-induced resonances appear in such systems that can reproduce previously unexplained phenomena, for instance, amplified microwave attenuation observed in sandstorms.