Question

In a potentiometer experiment, the balancing length of a cell is 560 cm. When an external resistance of 10 \(\Omega\) is connected in parallel to the cell, the balancing length changes by 60 cm. The internal resistance of a cell is

• A. 14 \(\Omega\)
• B. 16 \(\Omega\)
• C. 1.2 \(\Omega\)
• D. 1.2 \(\Omega\)

Hint:

In a potentiometer experiment, the change in the balancing length due to the addition of external resistance helps in calculating the internal resistance of the cell.

Answer 1

The Correct Option is A

By using the potentiometer relation \( V = IR \) and the formula for balancing length in a potentiometer experiment, we can calculate the internal resistance of the cell as 14 \(\Omega\). This is based on the change in the balancing length when an external resistance is connected.