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Q.

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 in figure by the curve:

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a

B

b

C

c

A

d

D

answer is B.

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Detailed Solution

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Current in the circuit $i = \frac{ε}{R + r}$

Potential Difference across R is $\nabla V = i R = \frac{ε R}{R + r}$

Therefore it is represented by curve B.

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