Electric Circuits
Two battery having unequal emf

 can be connected in series only.
 cannot be connected in series.
 both a and d
 cannot be connected in parallel.

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Electric Circuits
When we use super node technique

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

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