A circuit has resistors R 1 = 468 Ω and R 2 = 125 Ω R1=468 Ω and R2=125 Ω , and two batteries V 1 = 12.0 V and V 2 = 3.00 V V1=12.0 V and V2=3.00 V . The variable resistor R is adjusted until the galvanometer reads 0 A 0 A . Calculate the unknown resistance R R .

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Question:

A circuit has resistors R 1 = 468 Ω and R 2 = 125 Ω R1=468 Ω and R2=125 Ω , and two batteries V 1 = 12.0 V and V 2 = 3.00 V V1=12.0 V and V2=3.00 V . The variable resistor R is adjusted until the galvanometer reads 0 A 0 A . Calculate the unknown resistance R R .

Answers

Answer:0.0192AExplanation:Since, the reading of the galvanometer is 0 A, the voltage across the resistance R will be:Step 1VR = V2VR = 3.00vStep 2Calculating the current through the resistance R as below,IR = V1 - V2 /R1IR = 12 - 3 /468IR =0.0192A

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