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Q.

The figure shows a graph of current (I) flowing through a cell against its terminal voltage (V). The emf and internal resistance of this cell are :

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a

1 V; 0.25 Ω

b

1 V; 4 Ω

c

1 V; 1 Ω

d

0.25V; 0.25 Ω

answer is A.

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Detailed Solution

At I = 0, E = VT So, E = IVWhen VT=0, I=εrSo, r=14⇒r=0.25Ω
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