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Unformatted text preview: ε . The area of the two plates A is large enough so that the fringe effect is negligible. The mass of each plate is m. The upper plate is allowed to move up and down, but not horizontally. The lower plate is fixed on the substrate. A +Q x +Q Figure 1 Calculate the charge Q necessary to keep the upper plate at rest. 4. Using the fact that E → = kq (r → 1 – r → 2 ) / |r → 1 – r → 2 | 3 , V = kq (1/ |r → 1 – r → 2 |), prove that → ∇ × E → = 0 and E → ±±± = -∇ V. 5. Use Femlab to plot the magnitude of the E-field for the following two systems. The plates are assumed to be perfect conductors. ( a ) ( b )...
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- Spring '05
- Electromagnet, Electric charge, Fundamental physics concepts, 4 m, Electric Flux Density, Electromagnetic Engineering