A student measures the terminal potential difference (V) of a cell (of emf ε and internal resistance r) as a function of the current (I) flowing through it. The slope and intercept of the graph between V and I, then respectively. equal
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Given: A student measures the terminal potential difference 
of a cell ( of emf 
and internal resistance 
) as a function of the current ( 
) flowing through it.
To find the slope and intercept of the graph between 
and I
Solution:
The general equation of 
in cell:
Compare it with standard equation of the line:
Since graph of student is 
vs 
is 
and 
is 
Therefore, 
is intercept and 
is slope
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