Force between the plates of a parallel-plate capacitor

Yan, Fei; Wong, H. K.

doi:10.1119/1.17316

Cited by 3 publications

(3 citation statements)

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“…The field due to an iso-lated sheet of charge is ½ σ/ 0 , which is half as large as the field, E, between the capacitor plates. Equation (4) can thus be parsed as Q(½ E ). However, Gauss's law does not distinguish between the field due to one plate and that due to the other.…”

Section: Energy Flow For a Variable-gap Capacitormentioning

confidence: 99%

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Energy Flow for a Variable-Gap Capacitor

Greene

2005

The Physics Teacher

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When capacitor plates are separated, the capacitor's electrostatic energy either increases or decreases, depending upon whether the charge or the voltage is held constant. For the constant-voltage case, an interesting puzzle can be posed to students: How is it possible that an external agent does positive work on the capacitor while at the same time the capacitor's stored energy decreases? An energy flow diagram, as suggested by Art Hobson's TPT article,1 helps to visualize the movements of energy among different parts of the system. What Richard Feynman calls a “surprising factor of one-half” in the expression for the force between capacitor plates confronts students with an additional puzzle to decipher.2

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Section: Energy Flow For a Variable-gap Capacitormentioning

confidence: 99%

“…3,4 Constant-Voltage Case and the Flow of Energy Now let's repeat the above exercise, but keep the capacitor connected to a battery of voltage V while the plate separation is increased. The capacitor's stored energy is initially and finally…”

Section: Energy Flow For a Variable-gap Capacitormentioning

confidence: 99%

Energy Flow for a Variable-Gap Capacitor

Greene

2005

The Physics Teacher

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“…There have been many articles relating to capacitors and dielectric materials. [1][2][3][4][5][6][7][8][9][10] A frequent purpose of these experiments is to verify the relation between the capacitance and the plate separation based on the parallel plate capacitance equation:…”

Section: Introductionmentioning

confidence: 99%

Determining dielectric constants using a parallel plate capacitor

Grove¹,

Masters²,

Miers³

2004

American Journal of Physics

132

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The availability of low cost digital multimeters capable of measuring capacitance has made parallel plate capacitor investigations common in the introductory laboratory. Typically, students add multiple thin sheets of dielectric material between conducting plates. The capacitance is measured and then plotted versus the reciprocal of the dielectric thickness ͑the nominal plate separation͒. We explain why the experiment fails for small dielectric thickness and discuss an improved version of the experiment using dielectric sheets of various thicknesses rather than multiple thin sheets of a dielectric.

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Edge corrections for parallel-plate capacitors

Yariv

2020

Eur. J. Appl. Math

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Force between the plates of a parallel-plate capacitor

Cited by 3 publications

References 0 publications

Energy Flow for a Variable-Gap Capacitor

Energy Flow for a Variable-Gap Capacitor

Determining dielectric constants using a parallel plate capacitor

Edge corrections for parallel-plate capacitors

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