Problem 1
You set out to reproduce Thomsom's elm experiment with an accelerating potential of
150 V and a deflecting electric field of magnitude 6.0*10"6 N/C. a) At what fraction of
the speed of light do the electrons move? b) What magnitude of field will you need? C)
With this magnetic field, what will happen to the electron beam if you increase the
accelerating potential above 150 V?
f
~)
vl:
c ) L,4U.>" ..., ,J.~
~V
=[lU,.H
~::
C.
""f ,.J .t ~~M. ~(CL ~ t I ~..+
,../- I" ~ )c ~ 1'k. cJe)
rJ
...to" ~)(I;V")
t.l~,,{()"""ls
,A'I.J ~J, Co fu (G<..
11. =letd""Y5 :='I t;2f7
~.ot.lfl(O""'S t.=.!J
e4.flU." ~...
Problem 2
'"
~ II..,
f ,,I-#.I\
-Ii...1 l' {l... .e~ <f",,,,~rJ
v. ~')
cJd~711
'I:. cl ,,).L ,fk
=7 V ::~V
;; v::
q (( ~
/1 0
f'<.
.
ev
-,'/1 k
S.. 1~
~ -I J"... '"
f!>..
A straight horizontal copper rod carries a current of 50.0 A from west to east in a region
between the poles of a large electromagnet. In this region there is a horizontal magnetic
field toward the northeast (that is, 45 degrees north of east) with magnitude 1.20 T. a)
Find the magnitude and direction of the force on a 1.00 m section of rod. b) while
keeping the rod horizontal, how should it be orientated to maximize the magnitude of he
/oJ
force?
..,)
..)
b) 1~ 1'"1~-<""'''''''''
,'~
f.c..,.,1. ~ !> c..1'<..
~/ t-)/~..l
/ , 'Ii"
'\) = 1...f. /,5"oJ e
~
/
---'t I I::
:1 /I
/
/
.)
r.>
r
-
::. (1b)( I )(J.~){" "'J/) )
:: '11. ,,/N
\,
l
I I
()/I'e(.T/U
("1<.
,~ f~
~
G-::r()o
s~...
lJ-~j
rc, 1
t -Jirul,...
/Io.~
I "'\
6::.1
F :; 1.£ 5
::: (~)( 1)(t.I.(J):;
to-;7
)
~
[I""".},""
<i./- Y""")
-=7 p;; (<-(1,'-/t)#
Problem 3
A circular coil 0.0500 m in radius, with 30 turns of wire, lies in a horizontal plane, It
carries a current of 5.00 A in a counterclockwise sense when viewed from above. The
coil is in a uniform magnetic field directed toward the right (in the plane of the coil), with
a magnitude of 1.20 T. Find the torque on the coil.
'l.
t ,
-') 'Z.
A =rr(
~ IT{, oS-C));; ., ~5"ID
,
C>
-J:j
~I
"t ::.1 P.J.As,~e:: (1Xt.1.)[f,6')
lo-))5,.,<to -: .etf1-) )l're
&\::.16 rt-- c:J~10 0"'L~f