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CUET
Physics
Electromagnetic Induction
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For solenoid, if N is the number of turns, A is cross section area of solenoid, l is the length of wire then, Self Inductance is L=μ0N2Al0 A=πr2,Length of the wire usedl′=2πr×N ⇒L=μ0N2πr2l0=μ0(2πrN)24πl=μ0l′24πl0 4πLl0=μ0l′2 ⇒l′=√4πLl0μ0 |