Dielectric in Electric Field

This lecture covers the behavior of dipole moments in a material under an electric field, the concept of electrostatic potential energy, and the force on a dipole moment. The instructor demonstrates how a liquid crystal display works, showing the impact of an electric field on its appearance. The lecture also explains the force on a dipole in an inhomogeneous field, highlighting the role of the del operator. Through experiments with a dielectric material in a plate capacitor, the lecture illustrates the presence of bound charges and the reduction of the electric field strength. The concept of field due to polarization is introduced, showcasing how a dielectric affects the overall electric field in a capacitor.

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PHYS-201(d): General physics: electromagnetism

The topics covered by the course are concepts of fluid mechanics, waves, and electromagnetism.

An electric field (sometimes E-field) is the physical field that surrounds electrically charged particles and exerts force on all other charged particles in the field, either attracting or repelling them. It also refers to the physical field for a system of charged particles. Electric fields originate from electric charges and time-varying electric currents. Electric fields and magnetic fields are both manifestations of the electromagnetic field, one of the four fundamental interactions (also called forces) of nature.

The electric potential (also called the electric field potential, potential drop, the electrostatic potential) is defined as the amount of work energy needed per unit of electric charge to move this charge from a reference point to the specific point in an electric field. More precisely, it is the energy per unit charge for a test charge that is so small that the disturbance of the field under consideration is negligible.

A magnetic field is a vector field that describes the magnetic influence on moving electric charges, electric currents, and magnetic materials. A moving charge in a magnetic field experiences a force perpendicular to its own velocity and to the magnetic field. A permanent magnet's magnetic field pulls on ferromagnetic materials such as iron, and attracts or repels other magnets.

In physics, the electric displacement field (denoted by D) or electric induction is a vector field that appears in Maxwell's equations. It accounts for the electromagnetic effects of polarization and that of an electric field, combining the two in an auxiliary field. It plays a major role in topics such as the capacitance of a material, as well the response of dielectrics to electric field, and how shapes can change due to electric fields in piezoelectricity or flexoelectricity as well as the creation of voltages and charge transfer due to elastic strains.

In physics, a dipole () is an electromagnetic phenomenon which occurs in two ways: An electric dipole deals with the separation of the positive and negative electric charges found in any electromagnetic system. A simple example of this system is a pair of charges of equal magnitude but opposite sign separated by some typically small distance. (A permanent electric dipole is called an electret.) A magnetic dipole is the closed circulation of an electric current system. A simple example is a single loop of wire with constant current through it.

Electric Fields and Currents PHYS-201(d): General physics: electromagnetism

Explores electric fields, energy storage, charge displacement, DC currents, and historical aspects of electricity.

Electric Field of Dipole Moment PHYS-201(d): General physics: electromagnetism

Explores the electric field of a dipole moment and the concept of bound charges in a dielectric.

Capacitors in Parallel and Series PHYS-201(d): General physics: electromagnetism

Covers the analysis of capacitors in parallel and series arrangements and the world's largest capacitor bank.

Electrostatic in Matter: Electric Dipoles and Energy Density

Covers electric dipoles, energy in fields, and polarization forces in different materials.

Dielectric Materials: Polarization and Capacitors PHYS-201(d): General physics: electromagnetism

Explores dielectric materials, polarization, and capacitors, focusing on bound charges and the impact of dielectric constant.