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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 Fall '08
 Avery
 Physics, Charge, Magnetic Field, RLC, Electric charge, RLC Series/Parallel AC

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