Electric Circuits
A pole of driving point impedance is

 zero current for a finite value of driving current.
 zero voltage for a finite value of driving current.
 zero voltage for a finite value of driving voltage.
 zero current for a finite value of driving voltage.

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Electric Circuits
When we use super node technique

 ideal voltage source is connected between non reference node and reference.
All of these
 current source branch is common for two meshes.
 ideal voltage source is connected between two non reference nodes.

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