152 Key Formulas

1 1 1 series cequiv c1 c2 chapter

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Unformatted text preview: spherical distribution: € inside electrostatic conductor: E = 0 Chapter 29: Electric Potential U = qV ; ΔU = qΔV uniform field: multiple point charges: ; ΔV = EΔs point charge: ; Chapter 30: Potential and Field outside a spherical distribution: Capacitance and capacitors parallel ­plate: Key Formulas 6 Combining capacitors Energy of a capacitor parallel: Cequiv = C1 + C2 + ... −1 Ⱥ 1 Ⱥ 1 + ...Ⱥ series: Cequiv = Ⱥ + Ⱥ C1 C2 Ⱥ € Chapter 31: Current and Resistance € Current I= Q dQ Iavg = Δt dt Current density € R=ρ A Ohm’s Law Key Formulas 7 Chapter 32: Fundamentals of Circuits Kirchhoff’s rules loop: ∑ (ΔV ) i Power = 0 general: P = IΔV around loop resistor: P = I 2 R junction: ∑ Iin = ∑ Iout Combining resistors DC Circuits € of voltage changes Sign ΔV = – parallel: Requiv Ⱥ 1 Ⱥ −1 1 = Ⱥ + + ...Ⱥ Ⱥ R1 R2 Ⱥ series: Requiv = R1 + R2 + ... –ε €RC circuit + € time constant: ΔV = +ε discharging: ΔV = +IR charging: charge and discharge: I ΔV = –IR ΔV = –Q/C – + ΔV = +Q/C Key Formulas 8 Chapter 33 Magnetism µ 0 qv × r ˆ point charge: B = 2 4π r Force on a charged particle Fmagnetic = qv × B µ 0 IΔs × r ˆ current segment: ΔB = 2 4π r € µ0 = 4π x 10–7 Tm/A Ampere’s law s ∫...
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