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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:
A
`V = IR = (E/(r + R))R , dV/dR = er/(r + R)^(2)`
therefore slope decreases on increasing R
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