95-演示文稿-恒定电流场(双语).pptx
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4. Boundary Conditions for Steady Electric Currents
The integral forms of the equations for steady electric current field are as follows:;;5. Energy Dissipation in Steady Electric Current Fields;The power dissipation P is;Suppose the electric potential difference between two end faces;Example 1. A parallel plate capacitor consists of two imperfect dielectrics in series. Their permittivities are ?1 and ?2 , the conductivities
are ?1 and ?2 , and the thickness are d1 and d2, respectively. If the impressed voltage is U, find the electric field intensities, the electric energies per unit volume, and the power dissipations per unit volume in two dielectrics.;The electric energies per unit volume in two dielectrics, respectively,;Example 2. A quarter of a flat circular conducting washer is shown