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Byju's Answer
Standard XII
Physics
Self Induction
Self-Inductan...
Question
Self-Inductance of a Long Solenoid is proportional to(where
r
is radius of solenoid)-
A
r
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B
r
2
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C
r
3
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D
does not depend upon
r
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Solution
The correct option is
B
r
2
N
=total number of turns in solenoid
l
=length of solenoid
R
=radius of cross section of solenoid
Magnetic field inside solenoid =
B
=
μ
o
N
l
i
where,
N
l
=number of turns per unit length
Now, emf induced=
E
=
N
B
A
⟹
E
=
N
×
μ
o
N
l
i
×
π
R
2
⟹
E
=
μ
o
N
2
π
R
2
l
i
=
L
i
where
L
=self inductance
Thus,
L
=
μ
o
N
2
π
R
2
l
Hence,
L
∝
R
2
Answer-(B)
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