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Identify the bridge circuit.

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To find the total resistance measured at PQ, we need to simplify the circuit by identifying series and parallel combinations.

Step 1: Identify the bridge circuit.
Let's label the nodes for clarity.
Let P be the input terminal and Q be the output terminal.
The circuit can be seen as:

  • A 1 Ω1\,\Omega resistor from P to Node A.
  • A 1 Ω1\,\Omega resistor from Q to Node B.
  • A 2 Ω2\,\Omega resistor from Node A to Node C.
  • A 2 Ω2\,\Omega resistor from Node B to Node D.
  • A 3 Ω3\,\Omega resistor connecting Node C and Node D.
  • A 2 Ω2\,\Omega resistor from Node C to Q.
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