INTERNAL RESISTANCE AND EMF
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Current Electricity

268502 A battery ofemf ' \(E\) ' and internal resistance ' \(r\) ' is connected to a resistor of restance ' \(r_{1}\) ' and \(\mathbf{Q}\) J oules of heat is produced in a certain time' \(t\) '. W hen the same battery is connectted to another resistor of resistance \(r_{2}\) the same quantity of heat is produced in the same time ' \(t\) '. Then, the value of ' \(r\) ' is \((M-2011\) )

1 \(\frac{r_{1}^{2}}{r_{2}}\)
2 \(\frac{r_{2}^{2}}{r_{1}}\)
3 \(\frac{1}{2}\left(r_{1}+r_{2}\right)\)
4 \(\sqrt{r_{1} r_{2}}\)
Current Electricity

268503 Theemf of a cell \(E\) is \(15 \mathrm{~V}\) as shown in the figure with an internal resistance of \(0.5 \Omega\). Then the value of the current drawn from the cell is
(M-2013)

1 \(1 \mathrm{~A}\)
2 \(3 \mathrm{~A}\)
3 \(2 \mathrm{~A}\)
4 \(5 \mathrm{~A}\)
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Current Electricity

268502 A battery ofemf ' \(E\) ' and internal resistance ' \(r\) ' is connected to a resistor of restance ' \(r_{1}\) ' and \(\mathbf{Q}\) J oules of heat is produced in a certain time' \(t\) '. W hen the same battery is connectted to another resistor of resistance \(r_{2}\) the same quantity of heat is produced in the same time ' \(t\) '. Then, the value of ' \(r\) ' is \((M-2011\) )

1 \(\frac{r_{1}^{2}}{r_{2}}\)
2 \(\frac{r_{2}^{2}}{r_{1}}\)
3 \(\frac{1}{2}\left(r_{1}+r_{2}\right)\)
4 \(\sqrt{r_{1} r_{2}}\)
Current Electricity

268503 Theemf of a cell \(E\) is \(15 \mathrm{~V}\) as shown in the figure with an internal resistance of \(0.5 \Omega\). Then the value of the current drawn from the cell is
(M-2013)

1 \(1 \mathrm{~A}\)
2 \(3 \mathrm{~A}\)
3 \(2 \mathrm{~A}\)
4 \(5 \mathrm{~A}\)
For More Updates join with Us
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