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It is the ground node. You need to find all extraordinary nodes when using node-voltage analysis; choose one to be ground. It can be selected arbitrarily.

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14y ago
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eeescience

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1y ago

This video explains node voltage analysis in detail:

youtu.be/r3otLqHQ6L8

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Q: What is a reference node and how is it used in the analysis of dc circuits?
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