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8. The current in a simple series circuit is 5 amp. When an additional resistance of 2 ohms is inserted in series, the current drops to 4 amp. What is the resistance of the original circuit?

  • physics -

    V/r=5
    V/(r+2)=3

    V=5r
    V=3r+6

    5r=3r+6
    r=3

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