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Question
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 ______.
Options
MCQ
Fill in the Blanks
Solution
Explanation:
Current in the circuit,
I = `epsilon/("R"+"r")`
Potential difference across R,
V = IR = `(epsilon/("R"+"r"))`
R = `(epsilon/(1+"r"/"R"))`
When R = 0, V = 0
R = `oo`, V = ε
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