Example image of eyePlorer eyePlorer map for 'Electret': Dielectric Dipole Electric charge Electricity Magnet Polarization density Electric field Electrostatics Oliver Heaviside Electrophorus Alessandro Volta Johan Wilcke Capacitor Ferroelectric capacitor Ferroelectricity Hysteresis Space charge Surface charge Ferroelectret Piezoelectricity Quartz Fluoropolymer Polyethylene terephthalate Polymer Polypropylene Resin Wax Beeswax Carnauba wax Rosin Corona discharge High voltage Particle accelerator Exponential decay Relative static permittivity Resistivity Polytetrafluoroethylene Amorphous solid Electret microphone Photocopier Air filter Ionizing radiation Radon Stax Earspeakers Schoeps Sérgio Mascarenhas de Oliveira Bound state Jacques Lewiner Preamplifier Duality (electricity and magnetism)