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.

Question

Physics

Emmanuel Hess

15 March, 10:30

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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Answers (1)

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Zaire Trevino · Answer 1

0.0192A

Explanation:

Since, the reading of the galvanometer is 0 A, the voltage across the resistance R will be:

Step 1

VR = V2

VR = 3.00v

Step 2

Calculating the current through the resistance R as below,

IR = V1 - V2 / R1

IR = 12 - 3 / 468

IR = 0.0192A