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Byju's Answer
Standard XII
Physics
Electric Field Due to a Dipole Along the Equatorial Line
A wheel of 8 ...
Question
A wheel of 8 metallic spokes each 50cm long is rotated with a speed of 120 rev/min in a plane normal to the horizontal component of Earth's magnetic field BH at a place. If BH=0.4G at the place, what is the induced EMF between the axle and the rim of the wheel?
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Solution
Dear student,
V
e
r
t
i
c
a
l
c
o
m
p
o
n
e
n
t
o
f
e
a
r
t
h
m
a
g
n
e
t
i
c
f
i
e
l
d
i
s
g
i
v
e
n
b
y
:
B
v
=
B
sin
δ
B
=
0
.
4
G
δ
=
60
B
v
=
B
sin
60
B
v
=
0
.
4
×
3
2
B
v
=
0
.
692
G
=
0
.
692
×
10
-
4
t
e
s
l
a
l
e
n
g
t
h
o
f
t
h
e
s
t
r
o
k
e
w
i
l
l
a
c
t
a
s
t
h
e
d
i
a
m
e
t
e
r
.
r
a
d
i
u
s
r
=
50
2
r
=
25
c
m
=
0
.
25
m
A
r
e
a
a
=
π
r
2
a
=
3
.
14
×
0
.
25
×
0
.
25
a
=
0
.
19
m
2
ω
=
2
π
ν
ν
=
120
r
e
v
o
l
u
t
i
o
n
p
e
r
m
i
n
=
2
r
e
v
p
e
r
s
e
c
o
n
d
ω
=
2
×
3
.
14
×
2
ω
=
12
.
56
r
a
d
p
e
r
s
e
c
o
n
d
i
n
d
u
c
e
d
e
m
f
i
s
o
n
e
s
t
o
k
e
e
=
B
v
a
ω
cos
ω
t
e
=
0
.
692
×
10
-
4
×
0
.
19
×
12
.
56
cos
ω
t
e
=
0
.
1
×
10
-
3
v
o
l
t
=
0
.
1
m
i
l
l
i
v
o
l
t
f
o
r
t
h
e
8
s
t
o
k
e
s
e
=
8
×
0
.
1
m
i
l
l
i
v
o
l
t
e
=
0
.
8
m
i
l
l
i
v
o
l
t
a
s
n
o
o
f
s
t
o
k
e
s
i
n
c
r
e
a
s
e
s
.
i
n
d
u
c
e
d
e
m
g
i
n
c
r
e
a
s
e
s
.
Regards
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Q.
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