1. 16.360 Lecture 20 Today Conductors Resistance Dielectrics
Electric boundary conditions
Capacitance
Electrostatic potential energy
Image method

2. 16.360 Lecture 20 Conductors Electron drift velocity
Hole drift velocity
Conducting current
Point form of Ohm’s law

3. Lecture 20
Resistance
General form

4. Lecture 20
Joule’s law
General form

5. Lecture 20
Dielectrics
Electrical field induced polarization

6. 16.360 Lecture 20 Dielectrics P: electric polarization field
For homogeneous material:
Electric susceptibility
Relative permittivity:
Dielectric breakdown

7. 16.360 Lecture 20 Electric boundary condition
the tangential component is continuous
across the boundary of two media.

8. 16.360 Lecture 20 Electric boundary condition
the normal component of D changes, the
amount of change is equal to the surface
Charge density.

9. Lecture 20
Dielectric-Conductor boundary

10. Lecture 20
Conductor-Conductor boundary

11. Lecture 20
Capacitance

12. 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.