In a potentiometer experiment, the balancing length with a cell is 240 cm. On shunting the cell with a resistance of 2 Ω, the balancing length becomes 120 cm. The internal resistance of the cell is
1 Ω
0.5 Ω
4 Ω
2 Ω
Next Question
The thermo emf of a thermocouple varies with the temperature θ of the hot junction as E = aθ + bq2 (in volts) where the ratio a/b is 700°C. If the cold junction is kept at 0°C, then the neutral temperature of the thermocouple is: