.…/__<\z_\ii
‘
<:
f
'
——
.
—
__//
__
.
.
.
__/ 3
%
“%
EXPERIMENT 2—3
45
'Y"
"
—
-
The V lü2Ë
of V and ] are then recorded.
-
__;«3 \l
./_;'
.
.
.
.
.
from four to rune times With var1ous values
of 17 and /wf‘
:
'
Calculaliom.—l. The eld strength H is calculated from the
equation
27r7mZ]
3 7‘2
‘
H = ——
1 + —— a2 -— 4x2
.
.
.
oersteds
2—30
_
1053
_4 b4
(
) +
(
)
where”, is the total number of turns on both coils, ] is the current
in amperes, @, &, x, and r are the distances in centimeters indicated
in gure' 2—13.
'
.
2. The ratio of charge to mass is calculated from the equation
.
,
e
2\ÆV >< 108
/
(2 31
_
-
——
=
———‘————
e.m.u.
.
—
m
%
)
3. The velocity of the electrons is calculated from the equation
_
-
-
2\ÆV><108
./
,‘
.
v=——————cm.sec..
—
'
_
‘
/
'
‘
_
—
,
_
_
-
ï'
‘
ALTERNATNEMETHODOF MEASURING re/m
,
'
‘
Ï, AModedLena7dMhgdllA1argeæâôlenOidçwound on a
"
* '
barrellsusedtcproduœthemagnetlceldäinsteàd Of the
Abymeansofatangentgälvanometer
‘
_
i
theposmn0fthespoththescreennoœdThetubelsthen
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