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Physics
Classical Physics
Electromagnetism
Formula for force between two sheets of aluminum foil under voltage
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[QUOTE="berkeman, post: 6829695, member: 8921"] The limiting factor in a parallel plate capacitor arrangement is the arc-through Electric field level. If you charge the capacitor up to too high of a voltage, you generate an arc through the dielectric (or vacuum) between the plates. Different dielectric materials have different arc-through E-field values, and low-pressure gas and vacuum arc-through E-field values are described by the Paschen Curves: [URL='https://en.wikipedia.org/wiki/Paschen%27s_law']https://en.wikipedia.org/wiki/Paschen's_law[/URL] To calculate the E-field value for different dielectrics and different capacitor plate spacings, you would use the basic capacitor equations (which assume as mentioned above that the plate spacing d is much less than the plate dimensions for the area A): $$Q=CV$$ $$C=\epsilon \frac{A}{d}$$ $$E = \frac{V}{d}$$ Where ##\epsilon = \epsilon_0 \epsilon_r## which takes into account the relative permittivity of the dielectric. I haven't worked through the equations to figure out how to get the maximum force (what is the optimum dielectric and spacing, given the constraints imposed by arc-through issues), but you might try using these equations and the previous force equations to work through that... :smile: [/QUOTE]
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Electromagnetism
Formula for force between two sheets of aluminum foil under voltage
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