Physics 142, Spring 2009 Quiz 4
Name: _
1. [8 points] An inductor with an inductance of #! mH and a resistance of &! H is connected to a *!-volt battery. Find the current in the circuit &! ms later.
2. [6 points] A &!-.F capacitor is charged by a $!-V pow
Practice Problem Solutions
1. (a) The electric field E at the origin is the sum of three vectors, one for each charge:
Using Coulomb's Law I I" I#
" ; , the magnitudes of the vectors are: %1%! <# I$ " % .G "%$) N.G %1%! a& cmb#
" # .G ("* N.G %1%! a& cmb
Equation List
Electric Fields
t
t
F ;E
5/
t
E
" ;
r
s
%1%! <#
%! )& "!"# C# N m#
"
)* "!* N m# C#
%1%!
Gauss's Law
t t
FI ( E . A
FI
Uinside
%!
Electric Potential
t
E
Y ;Z
?Z
?=
Z
" ;
%1%! <
DC Circuits
M
U
?>
c MZ M # V
Z MV
Vtot V" V# (series)
Vt
Physics 142, Spring 2009 Name; 3 O L U T l O N
Exam 1
l . [16 points] Consider two point charges located on the y-axis, as shown in the gure below:
d'frecl'lOW'. Sam 05 C. 8!
II? / Unil- vecl-or'. (0.8, 0.6)
39
(a) [10 pts] Find the magnitude
Physics 142, Spring 2009
Quiz 5 Solutions
1. [7 points] In the figure below, the electric field in the shaded region is increasing at a rate of
$! kVm s. Determine the magnitude and direction of the induced magnetic field at the point T .
2. [5 points] An
Physics 142, Spring 2009 Quiz 6 Solutions
1. [4 points] While viewing your image in a concave mirror, you move your finger towards the mirror until the tip of your finger appears to touch its own reflection. At that moment, the tip of your finger is )# cm
Physics 142, Spring 2009 Exam 2
Name: _
1. [16 points] In the figure below, one wire carries $! A of current in the positive direction along the C-axis, and a second wire carries &! A of current in the positive D -direction at the location shown. Find the
Physics 142, Spring 2009 Quiz 3
Name: _
1. [8 points] A circuit sits in a uniform magnetic field, as shown in the figure below. The circuit consists of a 2-volt power supply connected to a 5-ohm resistor. The magnetic field strength is !( T, and is decrea
Physics 142
Laboratory 4
AC Circuits and Filters
In this lab, we will explore the response of RC circuits to an applied AC voltage. The reactance \G of
the capacitor is
\G
"
"
,
#1 0 G
=G
and the total impedance of the circuit is
#
^ V # \G .
The voltage