1 of 2 PHYS1120 Exam I review Things to remember for PHYS1110: • algebra, trig (sin, cos, ..) • vector math, especially vector addition • Fnet = ma problems, free-body diagrams Ch.21 Charges and Fields • Coulomb's Law: qqFkr=122 • Definition of electric field: on qon qFE,Fq==KKKqEK • E-field due to a point charge: QˆEkr=2Kr.+= (derived from Coulomb + definition of E) • E-field due to many charges: tot iiE E EEE..==++∑12 3KKKKK(fields add like vectors, not numbers) • Know how to set up an integral: totEdE∫KKtot,x xEd= , E∫, dQdE kr=2, dQ dx or dA or dV= λσρ depending on geometry • Field line diagrams Ch.22 Gauss's Law • Electric flux: (if E constant, surface flat), EAΦ = ⋅KKE daΦ = ⋅∫KK • Gauss's Law: enclosed0SQEda⋅ =∫KKvε • Main results for spherical, cylindrical, and planar symmetry E inside charged spherical shell = 0 E outside charged spherical charge = same as point charge E outside cylindrical charge distribution ∝ 1/r infinite plane: E =02σε 9/14/2009 Phys1120 Dubson ©University of Colorado at Boulder2 of 2 • Metals in equilibrium: E = 0 inside metal , qnet,inside = 0, qnet on surface only, E ⊥ surface, outsideE =0σε 9/14/2009 Phys1120 Dubson ©University of Colorado at
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