If I have two air-core solenoids and position them end-to-end so their magnetic fields oppose (N to N or S to S), does this increase or decrease the impedance of each coil?
Has this ever been used as a form of tuning an LC circuit, i.e. varying the distance between two bucking coils?
Robert Miller
Take a look at the 'variometer'
If opposed, it decreases it, closer decreases it more, when they are exactly superimposed* the net inductance is zero.
(*) exact superposition is only possible with theoretical inductors - real solenoids have solid parts.
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