Thomson’s Discovery of
the Electron
Clicker Activities
A charge will pass through the region
shown below. Initially there is no
magnetic or electric field in the region.
Observe the path of the charge.
A magnetic field will be turned on as
shown. The x’s mean that the field is
directed into the page. Observe the
path of the charge now.
Answer the following on your
own.
What is the sign of the charge.
3.
0%
0%
In
su
ffi
ci
en
tI
nf
+
0%
or
m
at
io
n
2.
+
Insufficient
Information
-
1.
1
2
3
4
5
Consult with your neighbors and
answer again.
What is the sign of the charge.
3.
0%
0%
In
su
ffi
ci
en
tI
nf
+
0%
or
m
at
io
n
2.
+
Insufficient
Information
-
1.
1
2
3
4
5
Now instead of a magnetic field, an
electric field will be created by charging
the plates as shown.
Answer the following on your
own
Predict the direction the charge
will be deflected by the electric
field
2.
Up
Down
0%
D
U
p
0%
ow
n
1.
1
2
3
4
5
Consult with your neighbor and
answer again.
Predict the direction the charge
will be deflected by the electric
field
2.
Up
Down
0%
D
U
p
0%
ow
n
1.
1
2
3
4
5
Answer the following on your
own
Predict the path of the charge
when both fields are turned on
1
2
3
4
5
an
sw
he
r
st
ra
ot
m
e
So
W
ill
g
o
on
e
irs
t
ct
f
er
t
ig
h
d.
..
...
d
ef
le
ill
d
W
W
ill
w
ig
g
le
4.
0% 0% 0% 0%
an
3.
ck
2.
Will wiggle back
and forth
Will deflect first
one direction then
the other
Will go straight
Some other
answer
ba
1.
Consult with your neighbors and
answer again.
Predict the path of the charge
when both fields are turned on
1
2
3
4
5
an
sw
he
r
st
ra
ot
m
e
So
W
ill
g
o
on
e
irs
t
ct
f
er
t
ig
h
d.
..
...
d
ef
le
ill
d
W
W
ill
w
ig
g
le
4.
0% 0% 0% 0%
an
3.
ck
2.
Will wiggle back
and forth
Will deflect first
one direction then
the other
Will go straight
Some other
answer
ba
1.