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phy2054notes - Supplementary Notes for Physics 2 Discussion...

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Unformatted text preview: Supplementary Notes for Physics 2 Discussion Physics Tomoyuki Nakayama a.k.a Tom I jjust started to make the notes so ust don’t expect too much don’t Fundamentals of Electric & Magnetic Field Field Electric Field is produced by Electric charges. charges. Electric field due to point Electric charge q is given by: charge E = (1/4πε)(q/r2) (Coulomb’s law) (Coulomb’s If you can choose a closed If surface on which E is constant, you can use constant, E┴A = Qin/ε (Gauss’s Law) Magnetic Field is produced by moving charges or currents. Magnetic field due to a moving charge or current element is given by: B = (μ/4π)(qvsinθ/r2) = (μ/4π)(IΔLsinθ/r2) (Biot­Savart Law) If you can choose a closed loop on which B is constant, you can use B║L = μIin (Ampere’s Law) Application of Gauss’s Law & Ampere’s Law Law Electric field due to a Electric uniform charge distribution along a long, straight line. long, Magnetic field due to Magnetic a steady current in a long, straight wire. RLC Series/Parallel AC Circuit RLC RLC in Series I iis common. (So we use I s as a reference.) as ΔV across R is in phase across w/ I & ΔVR = RI ΔV across L is 90º ahead across of I & ΔVL = XLI. ΔV across C is 90º across behind I & ΔVC = XCI. RLC in Parallel ΔV iis common. (So we s use ΔV as a reference.) I iin R is in phase w/ ΔV & n IR = ΔV/R. I iin L is 90º behind ΔV & n IL = ΔV/XL. I iin C is 90º ahead of ΔV n & IC = ΔV/XC. Impedance &Phase Angle of RLC Series/Parallel AC Circuits Series/Parallel RLC in Series Total voltage drop is Total the vector sum of the voltages across each element. element. RLC in Parallel Total current is the Total vector sum of the currents in each element. element. ...
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