When a resistance R 1 is connected across the terminals of a cell, the current is I 1 . When the resistance is changed to R 2 , the current is I 2 . The internal resistance of the cell is:
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
Let the emf of cell be E and internal resistance be r.
Then, 
and 
On dividing, we get
or 
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