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A cell having an emf E and internal resi...

A cell having an emf E and internal resistance r is connected across a variable external resistance R. As the resistance R is increased, the plot of potential difference V across R is given by

A

B

C

D

Text Solution

Verified by Experts

The correct Answer is:
C
The current through the resistance R
`I = ( ( epsilon)/( R+ r))`
The potential difference across R
`V= IR= ((epsilon)/(R+ r)) R`
`V= ( epsilon)/( (1+ (r )/( r)))`
when `R=0, V=0`,
`R= 00, V= epsilon`
Thus V increases as R in increases upto certain limit, but it does not increase further.
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