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Current Electricity — Physics STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 SciencePhysicsCurrent Electricity1 Mark
Question
A source with e.m.f. '$\varepsilon$'and internal resistance 'r' is combined with external resistance 'R'. Write the value of voltage on resistance R.
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Answer

Value of voltage on resistance $R$ is: $V=\frac{\varepsilon R}{R+r}$ or $V=\varepsilon-I r$

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