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Question

A cell of internal resistance r is connected across an external resistance nr. The the ratio of the terminal voltage to the emf of the cell is

A
1n
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B
1n+1
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C
nn+1
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D
n1n
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Solution

The correct option is C nn+1
Internal resistance =r, external resistance =nr
Let E= emf of cell.
Current drawn from cell is I=Er+nr
If V be the terminal voltage , V=EIr=EEr+nrr
or VE=11n+1=nn+1

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