Problems on Force Exerted by a Magnetic Fields from Ch 26 T&M
Problem 26.27
A current-carrying wire is bent into a semicircular loop of radius R that lies in the xy
plane. There is a uniform magnetic field B = Bk perpendicular to the plane of the loop.
Ve
HW12 Solutions (due Tues, Apr 21)
1. T&M 27.P.032
The current in the wire shown below is 8 A. Find B at point P due to
each wire segment and sum to find the resultant B.
Solution:
Picture the Problem Note that the current segments a-b and e-f do not contr
HW9 Solutions (HW9 due Tues, Mar 31)
1. T&M 36.P.38
For ground state of the hydrogen atom, calculate the probability
of finding the electron in the region between r and !r = 0.04a0 at
the positions r = a0 and r = 1.5a0 .
Solution:
In the ground state, ! (
HW12 Solutions (due Tues, Apr 28)
1. T&M 28.P.040
A uniform 1.2-T magnetic field is in the +z direction. A
conducting rod of length 15 cm lies parallel to the y axis and
oscillates in the x direction with displacement given by x = (2.0
cm) cos 120 t where
HW4 Solutions Notice numbers may change randomly in your assignments and you may have to recalculate solutions for your specific case. 1. T&L 6.P.03 In a region of space, a particle has a wave function given by
! (x) = Ae" x
2
/(2 L2 )
and energy E =
(a)
HW10 Solutions (due Tues, Apr 7)
1. T&M 40.P.066
The total energy consumed in the United States in 1 y is
approximately about 7.0 x 1019 J. How many kilograms of 235U
would be needed to provide this amount of energy if we
assume that 200 MeV of energy is
,3j'
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4p
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c) A= n(="-,.at' -;
-r
(.)
ir
'
v,u.[(r
-'l!),"
lq JL kc.-a
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/
I l*
,a=-/-6 lf'lq
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=' 8= 4- 6 nni
) /+tE - rY
f
/1 _. ,.1
Ti I n -_4,1/- =# (
4i
/rJ,=
k-r(/ - 4./r2/;,t
- * fu - - a [o+=r).4 ('6-fn,
- e') r
[ART B
Bl. A bullet is red vertically upwards from the ground with a speed of 300 11115. Find the time
thatthebulletisinthe air. t 1 £4:
ya=o v=ve+va +21
[1 y=0 O : U;-l; 4 x
y+ U:
i cg-cagom/sz 0-.- (U'i-
U'i- éat 0
32. Billiard balls have a mass of
HW1 Possible Solutions Notice numbers may change randomly in your assignments and you may have to recalculate solutions for your specific case. Tipler 14.P.003 An object attached to a spring has simple harmonic motion with an amplitude of A = 3.00 cm. Whe
HW14 Solutions (due Thurs, May 7)
1. T&M 30.P.003
Which of the following statements are true? (Select all that
apply.)
a) the electric and magnetic fields of an electromagnetic wave in
free space are in phase.
b) Electromagnetic waves are transverse waves
HW11 Solutions (due Tues, Apr 14)
1. T&M 26.P.024
A 10.0 cm length of wire carries a current of 4.0 A in the positive z
direction. The force on this wire due to a magnetic field B is = (-0.2
+ 0.2 ) j N. If this wire is rotated so that the current flows i
HW8, due Wed, Mar 25, at the beginning of class. 1. T&L 7.P.01 Find the energies E311, E222, and E321 and construct an energy level diagram for the three-dimensional cubic well that includes the third, fourth, and fifth excited states. Which of the states
Name_
Final Exam
Physics 248
M ay 14, 2007
Problems will be graded on reasoning and intermediate steps as well as on
the final answer. You must show all your work to receive full credit. If
you only provide your final answer, and do not show your work, yo
Problems selected from Tipler & Mosca on Electrostatics
Ch 21 Discrete Charge Distribution
Ch 22 The Electric Field: Continuous Charge Distribution
Ch 23 Electric Potential
Ch 24 Electrostatic Energy and Capacitance
Name_
Exam # 3
Physics 248
April 25, 2007
Problems will be graded on reasoning and intermediate steps as well as on
the final answer. Be sure to include units and direction of vectors when
needed.
Each problem is worth 25 points
Constants:
c 3 x 10 m/s, k
Discussion Session on Bohrs atom, Shroedinger equation of Hydrogen
atom, resistance and DC current
The hydrogen spectrum is found by collimating the light from a hydrogen
discarge tube and shining it on a grating to disperse the light into its various
col
Discussion Session on DC circuits
Problem 1
The resistivity of tungsten increases approximately linearly from 56 n m at 293 K and 1.1 m
at 3500 K. Estimate (a) the resistance and (b) the diameter of a tungsten filament used in a 40 W bulb,
assuming that t