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Question

Self-Inductance of a Long Solenoid is proportional to(where r is radius of solenoid)-

A
r
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B
r2
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C
r3
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D
does not depend upon r
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Solution

The correct option is B r2
N=total number of turns in solenoid
l=length of solenoid
R=radius of cross section of solenoid
Magnetic field inside solenoid =B=μoNli where, Nl=number of turns per unit length

Now, emf induced= E=NBA

E=N×μoNli×πR2

E=μoN2πR2li=Li
where L=self inductance
Thus, L=μoN2πR2l

Hence, LR2

Answer-(B)


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