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an electric cell with nominal voltage E has a resistance of 3Ω connected across it....

Physics
JAMB 2002

an electric cell with nominal voltage E has a resistance of 3Ω connected across it. If the voltage falls to 0.6E, the internal resistance of the cell is

  • A. 1Ω
  • B. 2Ω
  • C. 3Ω
  • D. 4Ω
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Correct Answer: Option B
Explanation

IR = 0.6 X I ( R + r )

I X 3 = 0.6 X I ( 3 + r )

3I / 0.6I = 3 + r

5 = 3 + r

r = 2 ohms

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