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Question

The internal resistance of a cell of e.m.f 2V is 0.2 Ω. It is connected to a resistance of 4 Ω. The voltage across the cell will be


A
0.5 V
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B
1.9 V
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C
1.45 V
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D
2 V
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Solution

The correct option is B 1.9 V
Relation between internal resistance and potential difference is given by,
V=ERR+r
R+r=ERV
Internal resistance
r=(EV1)R

Here V is potential across the cell and
E is emf of the cell

0.2=(2V1)×4V=1.9 volt

Physics

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