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  • A cell of emf E having an internal resistance ' r ' is connected  to an external resistance R. The potential difference ' V ' across the resistance R varies

A cell of emf E having an internal resistance ' r ' is connected  to an external resistance R. The potential difference ' V ' across the resistance R varies with R as shown by the curve:                  

Option: 1

A


Option: 2

B


Option: 3

C


Option: 4

D


Answers (1)

best_answer

Current given by the cell -

i=\frac{E}{R+r}

- wherein

R- External resistance

r-  internal resistance

 

V = E - ir =E - \frac{Er}{R+r} = E \left [ \frac{R+r-r}{R+r}\right ]

V =\frac{ER}{(R+r)}=\frac{E}{1+\frac{r}{R}}

\Rightarrow V = 0 \ at \ R = 0

V =E \ at \ R = \infty

Posted by

Suraj Bhandari

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