The open-circuit potential difference across the terminals of a cell balances on 150 cm of a potentiometer wire. When the cell is shunted by a 4.9 Ω resistor, the balancing length reduces to 147 cm. The internal resistance of the cell is
A. 0.01 Ω
B. 0.05 Ω
C. 0.1 Ω
D. 1 Ω
Answer:C
The open-circuit potential difference across the terminals of a cell balances on 150 cm of a potentiometer wire. When the cell is shunted by a 4.9 Ω resistor, the balancing length reduces to 147 cm. The internal resistance of the cell is
A. 0.01 Ω B. 0.05 Ω C. 0.1 Ω D. 1 Ω