A potentiometer circuit has been set up for finding the internal resistance of given cell. The main battery, used across the potentiometer wire, has an emf of 2.0 V and a negligible internal resistance. The potentiometer wire itself is 4 m long. When the resistance, R, connected across the given cell, has values of.
(i). Infinity
(ii). 9.5
the 'balancing lengths', on the potentiometer wire are found to be 3 m and 2.85 m, respectively.
The value of internal resistance of the cell is:
0.25
0.95
0.5
0.75
Option 1)
0.25
This option is incorrect
Option 2)
0.95
This option is incorrect
Option 3)
0.5
This option is correct
Option 4)
0.75
This option is incorrect