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

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

Correct Answer: Option B

Explanation

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