Question

in a potentiometer the balancing with a cell is at length of 220 cm .On shunting the cell wi6a resistance of 3 balance length becomes 130 cm . what is internal resistance of this cell
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Answer 1

Answer:

answer is 2.08 ohm

Explanation:

l1 = 220 cm

l2 = 130 cm

R = 3 ohm

r = (l1 - l2/l2) R

r =( 90/ 130 ) 3

270/130

= 2.08ohm