18. Three identical cells, each of emf. 2V and unknown internal resistance
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 Three identical cells, each of emf.

2V

and unknown internal resistance

are connected in parallel. This combination is connected to a

5

ohm

resistor. If the terminal voltage across the cell is

1.5

volt. What is the

internal resistance of each cell? Hence define the internal resistance of a

cell?

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Ans: It is given that,

E 2V, V 1.5V, R 5    Ω

Total internal resistance =

r

3

Internal resistance

r

is equal to:

E

r 1 R

V

 

     

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