Figure 11.9.4 In terms of the Kelvin force density,the dielectric liquid is pushed into the field region between capacitor plates because of the forces on individual dipoles in the fringing field. Courtesy of Hermann A.Haus and James R.Melcher.Used with permission. 20000 0e0 0 0000 0000 Eo Vo P-(e-eo) 000 0 + Depth d A linear dielectric is always attracted into a free space capacitor because of the net force on dipoles in the nonuniform field.The dipoles are now aligned with the electric field,no matter the voltage polarity. 6.641,Electromagnetic Fields,Forces,and Motion Lecture 12 Prof.Markus Zahn Page 9 of 96.641, Electromagnetic Fields, Forces, and Motion Lecture 12 Prof. Markus Zahn Page 9 of 9 Courtesy of Hermann A. Haus and James R. Melcher. Used with permission. + - v + -