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A string of five series resistors is connected across a 6 V battery. Zero voltage is measured across all resistors except R3. The voltage across R3 is

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A string of five series resistors is connected across a 6 V battery. Zero voltage is measured across all resistors except R3. The voltage across R3 is Answer: 6 V

In a series circuit, the sum of the voltage drops equals the source voltage. Since the other four resistors have zero voltage drop, the entire 6 V supply voltage must appear across R3.