Lecture 20 Today Conductors Resistance Dielectrics

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Presentation transcript:

16.360 Lecture 20 Today Conductors Resistance Dielectrics Electric boundary conditions Capacitance Electrostatic potential energy Image method

16.360 Lecture 20 Conductors Electron drift velocity Hole drift velocity Conducting current Point form of Ohm’s law

16.360 Lecture 20 Resistance General form

16.360 Lecture 20 Joule’s law General form

16.360 Lecture 20 Dielectrics Electrical field induced polarization

16.360 Lecture 20 Dielectrics P: electric polarization field For homogeneous material: Electric susceptibility Relative permittivity: Dielectric breakdown

16.360 Lecture 20 Electric boundary condition the tangential component is continuous across the boundary of two media.

16.360 Lecture 20 Electric boundary condition the normal component of D changes, the amount of change is equal to the surface Charge density.

16.360 Lecture 20 Dielectric-Conductor boundary

16.360 Lecture 20 Conductor-Conductor boundary

16.360 Lecture 20 Capacitance

16.360 Lecture 20 Electrostatic Potential Energy Image Method Any given charge above an infinite, perfect conducting plane is electrically equivalent to the combination of the give charge and it’s image with conducting plane removed.