GATE EE 2017 Set 1 — Question 19
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Electric Circuits → Network Solution Methods → Star-Delta Transformation
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Question
The equivalent resistance between the terminals A and B is ______ .
Correct answer
2.9 to 3.1
Solution
Identify the nodes. Let be the top-left node (after the from A), the top-middle node (after the ), and the bottom rail. The whole bottom wire is one node, and B connects to it through .Reading the figure (the two diagonals cross with a hop, so they are not joined):
- (vertical, left): to
- (diagonal from down to the bottom-middle): to
- (diagonal from the bottom-left up to ): to
- (vertical, middle): to
- (right loop): to , i.e.
- : to
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