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A cell has internal resistance r and electromotive force (e.m.f.) . The cell is connected in series with an ammeter and a variable resistor of resistance .
When is the ammeter reads . When is the ammeter reads . What is the value of ?
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. The cell is connected in series with an ammeter and a variable resistor of resistance 
.
the ammeter reads 
. When 
the ammeter reads 
. What is the value of 
