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The e.m.f. of a cell is 6 volt. When 2 a...

The e.m.f. of a cell is 6 volt. When 2 ampere current is drawn from it then th e potential difference across its terminal remains 3 volt. Its internal resistance.

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Internal resistance `r=(E-V)/( I)=(6-3)/(2)=1.5Omega`
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