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Calculate the effective resistance between A and B.

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Calculate the effective resistance between A and B.

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The electrical circuit can be redrawn as 

The resistance R1 and R2 are in series 

RS = R1 + R2 = 2 + 2 = 4Ω 

The resistance RS and R3 are in parallel

∴ Effective resistance Reff = 1.33Ω

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