Electric Circuits
A 60 Hz frequency voltage would cause a bulb to turn on and off

 60 times per second.
 80 times per second.
 120 times per second.
 70 times per second.

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Electric Circuits
When we use super node technique

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

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