Lecture-2-01-17-08 - Lecture-2 Charges can be accumulated,...

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1 Lecture-2 Charges can be accumulated, for example, by:
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2 Conductors: Charges are free to move and exist at surfaces. Insulators: Charges are immobile, and remain fixed wherever initially placed. Coulomb’s Law Electric Field of a distribution of charges 12 2 1 12 21 2 21 21 19 2 2 1 ˆˆ ˆ ; 4 (4 ) 8.99 10 o o QQ r Fr r r rr where kN C M πε −− == ≡= × r r 2 21 1 Q F E r r Lines of Force: How calculate? Numerical Calculation 12 F r 21 ˆ ˆ r r 21 F r
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3 Principle of Superposition Ex . Electric field due to a distribution of charges Continuous Distribution of Charges Point charge: Q, [C] Line charge of density λ , [C/m] Surface charge of density σ , [C/m 2 ] Volume charge of density ρ , [C/m 3 ] i i i i o r r Q E ˆ 4 1 2 = πε r r r d r r dA r r dl o o l l o o ˆ 4 1 ˆ 4 1 ˆ 4 1 2 2 2 1 ∫∫∫ ∫∫ τ ρ σ λ : Line charge : Surface charge : Volume charge (space charge)
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4 Electric Field of a Charged Disc Or , () R o R o R z z r z z r z rd dr d z E d dE dr dE d dr z E 0 2 2 0 2 / 3 2 2 2 0 0 2 0 2
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This note was uploaded on 02/20/2008 for the course PHYSIC 2 taught by Professor Kim during the Spring '08 term at Lehigh University .

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Lecture-2-01-17-08 - Lecture-2 Charges can be accumulated,...

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