INTERNAL RESISTANCE AND EMF
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Current Electricity

268453 A \(5 \mathrm{~V}\) battery with internal resistance \(2 \Omega\) and a \(2 \mathrm{~V}\) battery with internal resistance \(1 \Omega\) are connected in parallel with unlike polarities connected together .This combination is connected to \(10 \Omega\) resistor The current in the \(10 \Omega\) resistor is

1 \(0.27 \mathrm{~A}\)
2 \(0.05 \mathrm{~A}\)
3 \(0.25 \mathrm{~A}\)
4 \(0.3 \mathrm{~A}\)
Current Electricity

268454 A voltmeter resistance \(500 \Omega\) is used to measure the emf of a cell of internal resistance \(4 \Omega\). The percentage error in the reading of the voltmeter will be

1 \(0.4 \%\)
2 \(0.6 \%\)
3 \(0.8 \%\)
4 \(1.2 \%\)
Current Electricity

268455 When two identical cells are connected either in series or in parallel across a 4 ohm resistor, they send the same current through it. The internal resistance of the cell in ohm is

1 \(4 \Omega\)
2 \(2 \Omega\)
3 \(1 \Omega\)
4 \(7 \Omega\)
Current Electricity

268456 Two cells with same e.m.f. ' \(E\) ' and different internal resistances \(r_{1}\) and \(r_{2}\) are connected in series to an external resistance ' \(R\) '. The value of \(R\) so that the p.d. across the first cell be zero is

1 \(r_{2}-r_{1}\)
2 \(r_{1}-r_{2}\)
3 \(r_{1}+r_{2}\)
4 \(\frac{r_{1}-r_{2}}{2}\)
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Current Electricity

268453 A \(5 \mathrm{~V}\) battery with internal resistance \(2 \Omega\) and a \(2 \mathrm{~V}\) battery with internal resistance \(1 \Omega\) are connected in parallel with unlike polarities connected together .This combination is connected to \(10 \Omega\) resistor The current in the \(10 \Omega\) resistor is

1 \(0.27 \mathrm{~A}\)
2 \(0.05 \mathrm{~A}\)
3 \(0.25 \mathrm{~A}\)
4 \(0.3 \mathrm{~A}\)
Current Electricity

268454 A voltmeter resistance \(500 \Omega\) is used to measure the emf of a cell of internal resistance \(4 \Omega\). The percentage error in the reading of the voltmeter will be

1 \(0.4 \%\)
2 \(0.6 \%\)
3 \(0.8 \%\)
4 \(1.2 \%\)
Current Electricity

268455 When two identical cells are connected either in series or in parallel across a 4 ohm resistor, they send the same current through it. The internal resistance of the cell in ohm is

1 \(4 \Omega\)
2 \(2 \Omega\)
3 \(1 \Omega\)
4 \(7 \Omega\)
Current Electricity

268456 Two cells with same e.m.f. ' \(E\) ' and different internal resistances \(r_{1}\) and \(r_{2}\) are connected in series to an external resistance ' \(R\) '. The value of \(R\) so that the p.d. across the first cell be zero is

1 \(r_{2}-r_{1}\)
2 \(r_{1}-r_{2}\)
3 \(r_{1}+r_{2}\)
4 \(\frac{r_{1}-r_{2}}{2}\)
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Current Electricity

268453 A \(5 \mathrm{~V}\) battery with internal resistance \(2 \Omega\) and a \(2 \mathrm{~V}\) battery with internal resistance \(1 \Omega\) are connected in parallel with unlike polarities connected together .This combination is connected to \(10 \Omega\) resistor The current in the \(10 \Omega\) resistor is

1 \(0.27 \mathrm{~A}\)
2 \(0.05 \mathrm{~A}\)
3 \(0.25 \mathrm{~A}\)
4 \(0.3 \mathrm{~A}\)
Current Electricity

268454 A voltmeter resistance \(500 \Omega\) is used to measure the emf of a cell of internal resistance \(4 \Omega\). The percentage error in the reading of the voltmeter will be

1 \(0.4 \%\)
2 \(0.6 \%\)
3 \(0.8 \%\)
4 \(1.2 \%\)
Current Electricity

268455 When two identical cells are connected either in series or in parallel across a 4 ohm resistor, they send the same current through it. The internal resistance of the cell in ohm is

1 \(4 \Omega\)
2 \(2 \Omega\)
3 \(1 \Omega\)
4 \(7 \Omega\)
Current Electricity

268456 Two cells with same e.m.f. ' \(E\) ' and different internal resistances \(r_{1}\) and \(r_{2}\) are connected in series to an external resistance ' \(R\) '. The value of \(R\) so that the p.d. across the first cell be zero is

1 \(r_{2}-r_{1}\)
2 \(r_{1}-r_{2}\)
3 \(r_{1}+r_{2}\)
4 \(\frac{r_{1}-r_{2}}{2}\)
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Current Electricity

268453 A \(5 \mathrm{~V}\) battery with internal resistance \(2 \Omega\) and a \(2 \mathrm{~V}\) battery with internal resistance \(1 \Omega\) are connected in parallel with unlike polarities connected together .This combination is connected to \(10 \Omega\) resistor The current in the \(10 \Omega\) resistor is

1 \(0.27 \mathrm{~A}\)
2 \(0.05 \mathrm{~A}\)
3 \(0.25 \mathrm{~A}\)
4 \(0.3 \mathrm{~A}\)
Current Electricity

268454 A voltmeter resistance \(500 \Omega\) is used to measure the emf of a cell of internal resistance \(4 \Omega\). The percentage error in the reading of the voltmeter will be

1 \(0.4 \%\)
2 \(0.6 \%\)
3 \(0.8 \%\)
4 \(1.2 \%\)
Current Electricity

268455 When two identical cells are connected either in series or in parallel across a 4 ohm resistor, they send the same current through it. The internal resistance of the cell in ohm is

1 \(4 \Omega\)
2 \(2 \Omega\)
3 \(1 \Omega\)
4 \(7 \Omega\)
Current Electricity

268456 Two cells with same e.m.f. ' \(E\) ' and different internal resistances \(r_{1}\) and \(r_{2}\) are connected in series to an external resistance ' \(R\) '. The value of \(R\) so that the p.d. across the first cell be zero is

1 \(r_{2}-r_{1}\)
2 \(r_{1}-r_{2}\)
3 \(r_{1}+r_{2}\)
4 \(\frac{r_{1}-r_{2}}{2}\)
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