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# formulasheet - Electric Charges and Forces ( 29 1 2 1 on 2...

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Unformatted text preview: Electric Charges and Forces ( 29 1 2 1 on 2 2 on 1 2 p e on q on B B 2 / 1 ˆ point charge 4 K q q F F r q N N e E F q F q E q E r r πε = = =- = = = r r r r r The Electric Field ( 29 3 3 Electric dipole: , from negative to positive 1 2 Field on axis 4 1 Field in bisecting plane 4 Uniform infinite line of charge: 1 2 , perpendicular to l 4 net i i E E p qs p E r p E r E r πε πε λ πε = = = = - = ∑ r r r r r r r r 2 ine Uniform infinite plane of charge: , perpendicular to plane 2 Uniformly charged sphere: ˆ for 4 Parallel-plate capacitor: , from positive to negative E Q E r r R r E η ε πε η ε = = ≥ = r r r ( 29 ( 29 ( 29 ring 3/ 2 2 2 disk 2 2 1 4 1 2 z z zQ E z R z E z R πε η ε = + =- + ( 29 / sin a q m E pE τ θ = = r r Gauss’s Law e e surface in e surface = cos constant field at surface of a charged conductor: perpendicular to surface E A EA E dA Q E dA E E θ ε η ε Φ = ⋅ Φ = ⋅ Φ = ⋅ = = ∫ ∫ r r r r r r r Ñ Current and Conductivity e d d d 2 in out Electron current: rate of electron flow Conventional current:...
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## This note was uploaded on 03/08/2012 for the course PHY 203 taught by Professor Shelly during the Spring '12 term at Cecil College.

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formulasheet - Electric Charges and Forces ( 29 1 2 1 on 2...

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