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11 July, 01:12

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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  1. 11 July, 02:04
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    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
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