Effective resistance of parallel combination of four identical wires is 0.25 Ω. What will be effective resistance if connected in series?
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Effective resistance of parallel combination of four identical wires is 0.25 Ω. What will be effective resistance if connected in series?

G1 Physics · Accepted Answer

Step 1: Let one wire resistance r. Four in parallel gives r/4=0.25 Ω ⇒ r=1 Ω. Step 2: Four in series gives Rₛ=4r=4 Ω.