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When a resistance R is across a cell, the voltage across the terminals of the...

Physics
JAMB 1988
When a resistance R is across a cell, the voltage across the terminals of the cell is reduced to two-third of its normal value. The internal resistance of the cell is
  • A. \(\frac{2}{1}\)R
  • B. \(\frac{1}{2}\)R
  • C. \(\frac{3}{2}\)R
  • D. 5R
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Correct Answer: Option B
Explanation
IR = \(\frac{2}{3}\) I(R + r)

r = \(\frac{1}{2}\)R
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