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  4. A cell of emf E and internal resistance r is connected across an external resistance R. The graph showing the variation of P.D (across R) versus R is best represented by

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Q. A cell of emf E and internal resistance r is connected across an external resistance "R". The graph showing the variation of P.D (across R) versus R is best represented by

Solution:

$V = IR = \frac {ER}{(R+r)}$