Comparing self inductance of three solenoids

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Self-inductance in solenoids is primarily determined by their geometry rather than the winding direction, leading to the conclusion that solenoids with equal turns but opposite winding directions can have the same inductance. The discussion raises questions about the impact of superconducting wires on self-inductance, particularly regarding the Meissner effect, which causes magnetic fields to vanish inside superconductors. Participants debate the effective inductance of solenoids with alternating winding directions, with some arguing that mutual inductance can lead to a net inductance of zero under certain conditions. The clarity of the problem statement is criticized, as it uses terms inconsistently, causing confusion about whether the inductance being referenced is self-inductance or effective inductance. Overall, the conversation highlights the complexities of inductance calculations and the need for precise terminology in physics problems.
  • #31
@cnh1995 When split into composite parts, ## L_2 ## can be composed of self inductances and mutual inductance, but in the final tally, the inductance of ## L_2 ## includes the mutual inductance of the component parts. ## L_2=0 ## with your computation.
 
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  • #32
Charles Link said:
but in the final tally, the inductance of L2L2 L_2 includes the mutual inductance of the component parts. L2=0L2=0 L_2=0 with your computation.
Yes, that's why in #27, I said the "effective inductance" is zero (self minus mutual). But in the problem statement, it is mentioned that L2 is the "self" inductance of the coil, which is not zero.
 
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  • #33
cnh1995 said:
Yes, that's why in #27, I said the "effective inductance" is zero (self minus mutual). But in the problem statement, it is mentioned that L2 is the "self" inductance of the coil, which is not zero.
In that case, in the statement of the problem, the first time they mentioned ## L_2 ## they called it the "inductance of the coil", and the second time they called it the "self-inductance of the coil". This one is really splitting hairs with the use of the terms, when they themselves were rather careless in the use of the terms. I think they need to be much more clear in the statement of the problem.
 
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  • #34
Thanks all for your precious inputs .
 
  • #35
Charles Link said:
In that case, in the statement of the problem, the first time they mentioned ## L_2 ## they called it the "inductance of the coil", and the second time they called it the "self-inductance of the coil". This one is really splitting hairs with the use of the terms, when they themselves were rather careless in the use of the terms. I think they need to be much more clear in the statement of the problem.
I agree. That's where I tripped at first.
 

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