# Lec-7 - motion v rms v rms ∼ 10 6 m s – p Changes in V...

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Previous Lecture U cap = 1 2 CV 2 for capacitor Energy is stored in electric field: u = 1 2 ± 0 E 2 Dielectric constant K Current I is flow of charge – p.

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Current: Realistic Model Small drift velocity v d superimposed on large random motion ( v rms ). v rms 10 6 m / s – p.
Drift velocity To estimate v d , we use a different model, in which all charges move uniformly in one direction: – p.

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Drift velocity To estimate v d , we use a different model, in which all charges move uniformly in one direction: – p.
Drift velocity and Current – p.

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Current: Realistic Model Small drift velocity v d superimposed on large random

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Unformatted text preview: motion ( v rms ). v rms ∼ 10 6 m / s – p. Changes in V around a Loop Fig. 25.21 – p. Harder Problems? – p. Harder Problems? Use Kirchhoff’s Rules – p. Harder Problems? Use Kirchhoff’s Rules • Node equations – p. Harder Problems? Use Kirchhoff’s Rules • Node equations • Loop equations – p. Resistance and Resistivity Resistivity ρ is a material property; the resistance R depends on the length L and cross sectional area A of the conductor: R = ρL A – p....
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Lec-7 - motion v rms v rms ∼ 10 6 m s – p Changes in V...

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