The reading of an ideal voltmeter for a bridge circuit with upper series 20 Ω and 30 Ω, lower series 30 Ω and 20 Ω connected to 2 V battery is: [Diagram: Image]
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The reading of an ideal voltmeter for a bridge circuit with upper series 20 Ω and 30 Ω, lower series 30 Ω and 20 Ω connected to 2 V battery is: [Diagram: Image]

G1 Physics · Accepted Answer

Step 1: Each 20+30 Ω branch carries I=2/50=0.04 A. Step 2: Potential at upper midpoint relative to left terminal differs by 20×0.04=0.8 V. Lower midpoint differs by 30×0.04=1.2 V. Step 3: Voltmeter reads |1.2−0.8|=0.4 V.