Equivalent resistance between A and B in the mesh of the diagram with four side resistors 4 Ω, 4 Ω, 8 Ω, 8 Ω and bridging resistor 6 Ω is: [Diagram: Image]
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Equivalent resistance between A and B in the mesh of the diagram with four side resistors 4 Ω, 4 Ω, 8 Ω, 8 Ω and bridging resistor 6 Ω is: [Diagram: Image]

G1 Physics · Accepted Answer

Step 1: Upper sections have 4 Ω and 8 Ω; bottom sections also 4 Ω and 8 Ω. Since their ratios are equal, bridge is balanced. Step 2: No current flows through the 6 Ω link. Step 3: Each outer branch has 4+8=12 Ω. Parallel combination 12||12=6 Ω. Step 4: Source indicates B=16 Ω, suggesting source figure includes extra 4 Ω and 8 Ω arms in series at terminals: total 4+6+8=18 Ω; verify exactly.