Question

A potentiometer experiment the balancimg length with a cell is at a length 240 cm. On shunting the cell with resistance of 2 ohm the balancing length becomes 120 cm the internal resistance of cell is

Answer 1

Answer:

(b) : The internal resistance of a cell is given by  in-a-potentiometer-experiment-the-balancing-with-a-cell-is-at-length-240cm

Explanation:

r=R(l1-l2)/l2( it is small L1 AND SMALL L2)

=240-120

r=2(120/120)

r=2 ohms