RC Circuits
Circuits with capacitors, the currents vary
in time
Rate of charging or discharging
Serway: section 28.4
Discussion
2 F
+

100 k
The capacitor has an
initial charge of 20 mC.
a) The switch is now closed : What is the initial
current through t
More Examples of
BiotSavar'l' &
Ampére's Law BiotSavart Law:
Amperes Law: Quiz: A lighr, loose spir'ol spr'ing carrying no cur'r'enr
is hung from a ceiling. When a swirch is closed so
Thor a cir'cuir exisTs in The spring, do The coils:
a) move forrher'
Superposition of Waves Superposition of Waves
1) Identical waves in opposite directions:
I:> standing waves"
2) 2 waves at slightly different frequencies:
EI> beats
3) 2 identical waves, but not in phase:
21> interference Principle of Superposition
2 Wav
Self Inductance Self Inductance
A variable power' supply is connecTed To a loop.
The cur'r'enT in The loop cr'eoTes o mogneTic field.
WhoT happens when The power' supply dial is Tur'ned
down reducing The cur'r'enT, or' Tur'ned up increasing The
currenT?
SelfInductance and Circuits
 Inducror's in cir'cuirs
 RL cir'cuirs Inductors in Series and Parallel
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Flgure 2
Figure 3
LT : L1 +L2. = + SelfInductance
Selfinduced emf:
DC Circuits
~Ser'ies and parallel rules for' r'esisror's
~Kir'chhoff's cir'cuir r'ules DC Circuits
Direct Current or DC": current always flows in
one direction.
For circuits containing only resistors and emf's the
current is always constant in time. Circu
Charged Particles in Electric
and
Magnetic Fields
 Morion of charged particles
 Lor'enrz For'ce
 Examples: cyclorr'on, mass specrr'omerer' RecaH:
[77: in an elecTr'ic field
27: 917x E in a magneTic field
In general:
F: X q Lor'enrZ Force Magnetic Field
PREP101
PHY 1E03 Solutions
Exam 2003
2003 Exam
Q1 B)
An uncharged conductor is still full of equal numbers of positive and negative charges which
are free to move. The electric field from the charged insulator polarizes the conductor,
drawing the negative
Kirchhoffs Circuit Rules
Junction Rule: total current in = total current out
at each junction (from conservation
of charge).
Loop Rule: Sum of emfs and potential differences
around any closed loop is zero (from
conservation of energy; Vq = U).
Physics 1E0
P6.41 Two reservoirs, which differ in surface elevation by 40 m, are connected by 350 m of new pipe
of diameter 8 cm. If the desired flow rate is at least 130 N/s of water at 20 C, may the pipe material be
(a) galvanized iron, (b) commercial steel, or (c)
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Practice Problems 1
1. A 4.15109 C charge is located 3.05 m from a 3.02109 C charge. Find the
magnitude of the electrostatic force exerted by one charge on the other.
Answer: 1.21e08 N
2. Calculate the Coulomb force on q1, as seen in the figure below.
Physics 1E03
Version 1
Feb 7, 2013
Name_
Test Duration: 80 min
Instructors:
J. Preston (section C01)
N. McKay (section C04)
W. Okon (sections C02, C03 and C05)
Student Number:_
Mac email:[email protected]
Instructor:_
This test has 13 questions and eight page
Physics 1E03
Version 1
Feb 7, 2013
Name_
Test Duration: 80 min
Instructors:
J. Preston (section C01)
N. McKay (section C04)
W. Okon (sections C02, C03 and C05)
Student Number:_
Mac email:[email protected]
Instructor:_
This test has 13 questions and eight page