a potentiometer wire of length 1m has a resistance of 10ohm. it is connected to a 6v battery in series with a resistance 5 ohm. determin the emf of the primaty cell whoch gives the balance point at 40cm
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Voltage of wire = I×R
I=V/r+R = 6/15
Voltage= 6×10/15=6v
V/L= 6/100v/cm
Voltage of emf= 6×40/100
= 2.4V
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