Electric Circuits
A circuit with resistor, inductor, capacitor in series is resonant of 50 Hz. If all the values are now doubled, the new resonant frequency is

 f0 / 2.
 still f0.
 2f0.
 f0 / 4.

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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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