# eqs(3) - Laws, Principles, Useful Relationships,r and Other...

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Laws, Principles, Useful Relationships, and Other Information Coulomb's Rule r F e = k q 1 q 2 2 r ˆ r Def'n of E-Field r E r F q E-Field for Point Charge r E = k q 2 r ˆ r Electric Potential V = - r E d r s Def'n of Potential U q V Potential of a Charge V = k q r Def'n of Capacitance C Q V Cap. of Parallel Plates C = ε o A d Energy in C's U = 1 2 Q 2 C = 1 2 C V 2 Energy in E-Fields u U vol = 1 2 ε o E 2 B-Field u m = B 2 2 μ o C's: Series 1 C s = 1 C i Parallel C p = C i Dipoles: Def’ns r μ≡ I r A and r p q r d Torque r τ= r p × r E or r τ= r μ× r B Energy U = - r p r E or U = - r μ• r B Def'n of Current I dQ dt Def'n of Resistance R = ρ l A Ohm's Rule V = IR Power P = IV = V 2 R = I 2 R R's: Series R s = R i Parallel 1 R p = 1 R i RC: Charge q = CV 1 - e - t RC discharge q = CV o e - t RC Force Between Wires F m = μ o 2 π I 1 I 2 r l Def'n of B-Field r F I r l × r B Force on a Charge
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## This note was uploaded on 03/11/2012 for the course PHYSICS 204B taught by Professor Staff during the Fall '09 term at CSU Chico.

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