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Unformatted text preview: Electrostatics Force on charge in E-feld: F = q E E-feld o point charge at origin: E ( r ) = kq r r 2 E-feld o infnite sheet o uniorm charge: E = 2 k = / 2 E at surace o conductor: E n = 4 k = / Torque on electric dipole: = p E Potential o point charge at origin: V ( r ) = kq r Potential energy o single charge: U = qV Potential energy o system o charges: U = 1 2 q i V i i Energy density o E-feld: u e = 1 2 K E 2 Parallel plate capacitor (no dielectric): C = 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 V 2 DC Circuits Circuit equation: V b V a = E IR Power input to circuit element: P = I V Time constant in RC, RL circuits: = RC , = L / R Magnetic Fields Force on moving charge: F = q v B Force on current element: d F = I d l B Magnetic moment o plane loop: = I A Torque on magnetic moment: = B Biot-Savart law:...
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