ElectroMagnetic InductionHard
Question
A wire of fixed length is wound on a solenoid of length ′l′ and radius ′r′. Its self inductance is found to be L. Now if same wire is wound on a solenoid of length l/2 and radius r/2, then the self inductance will be:
Options
A.2L
B.L
C.4L
D.8L
Solution
L = 
length of wire = N 2πr = Constant (= C, suppose)
∴ L = m0
∴ L ∝ 
∴ Self inductance will become 2L.
length of wire = N 2πr = Constant (= C, suppose)
∴ L = m0
∴ L ∝ ∴ Self inductance will become 2L.
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