Question

A cell when balanced with potentiometer gave a balance
length of 50 cm. 4.5 ???? external resistance is introduced in
the circuit, now it is balanced on 45 cm. The internal
resistance of cell is
(a) 0.25 ???? (b) 0.5 ????
(c) 1.0 ???? (d) 1.5 ????

Answer 1

Answer:

B

Explanation:

The expression of internal resistance is r=R(

l

2

l

1

−1)=4.5(

45

50

−1)=0.5 Ω