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# formulas - Electrostatics Force on charge in E-feld F = q E...

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Unformatted text preview: Electrostatics Force on charge in E-feld: F = q E E-feld oÂ¡ point charge at origin: E ( r ) = kq Ë† r r 2 E-feld oÂ¡ infnite sheet oÂ¡ uniÂ¡orm charge: E = 2 Ï€ k Ïƒ = Ïƒ / 2 Îµ E at surÂ¡ace oÂ¡ conductor: E n = 4 Ï€ k Ïƒ = Ïƒ / Îµ Torque on electric dipole: Ï„ = p Ã— E Potential oÂ¡ point charge at origin: V ( r ) = kq r Potential energy oÂ¡ single charge: U = qV Potential energy oÂ¡ system oÂ¡ charges: U = 1 2 q i V i i âˆ‘ Energy density oÂ¡ E-feld: u e = 1 2 K Îµ E 2 Parallel plate capacitor (no dielectric): C = Îµ A / d Capacitors in series or parallel: 1 C eff = 1 C 1 + 1 C 2 , C eff = C 1 + C 2 Energy stored in capacitor: U = Q 2 2 C = 1 2 C â‹… Î” V 2 DC Circuits Circuit equation: V b âˆ’ V a = E âˆ’ IR Power input to circuit element: P = I Î” V Time constant in RC, RL circuits: Ï„ = RC , Ï„ = L / R Magnetic Fields Force on moving charge: F = q v Ã— B Force on current element: d F = I d l Ã— B Magnetic moment oÂ¡ plane loop: Î¼ = I A Torque on magnetic moment: Ï„ = Î¼ Ã— B Biot-Savart law:...
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formulas - Electrostatics Force on charge in E-feld F = q E...

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