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Byju's Answer
Standard X
Physics
Magnetic Flux and Magnetic Flux Density
A long thin s...
Question
A long thin solenoid has
900
turns/metre and radius
2.50
c
m
. The current in the solenoid is increasing at a uniform rate of
60
A
/
s
.
What is the magnitude of the induced electric field at a point
1.0
c
m
from the axis of the solenoid?
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Solution
B
=
μ
0
n
i
∴
d
B
d
t
=
μ
0
n
d
i
d
t
=
(
4
π
×
10
−
7
)
(
900
)
(
60
)
=
0.068
T
/
s
E
=
r
2
(
d
B
d
t
)
E
=
(
1
×
10
−
2
)
2
(
0.068
)
=
3.4
×
10
−
4
V
/
m
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0
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