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Byju's Answer
Standard XII
Physics
Exploiting Ampere's Law - Long Wire
A long soleno...
Question
A long solenoid of
100
cm
length, having
200
turns, carries
5
A
current. The magnetic field at one end of the solenoid is
(
μ
0
=
4
π
×
10
−
7
Tm/A
)
A
6.28
×
10
−
4
T
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B
2.6
×
10
−
4
T
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C
12.4
×
10
−
4
T
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D
9.81
×
10
−
3
T
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Solution
The correct option is
A
6.28
×
10
−
4
T
At end of a long solenoid, magnetic field is given as
B
=
μ
0
n
i
2
, where
n
is number of turns per unit length.
B
=
4
π
×
10
−
7
×
200
1
×
5
2
=
6.28
×
10
−
4
T
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