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In the circuit shown below, the ammeter reading will be independent of R2 when

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Important Questions on Current Electricity

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Gamma Question Bank for Engineering Physics>Chapter 17 - Current Electricity>Assignment>Q 5
A galvanometer of resistance 95 Ω shunted by a resistance of 5 Ω gives deflection of 50 divisions  when joined in series with a resistance of $20 \mathrm{k} \Omega$ and $2.0 \mathrm{V}$ accumulator. The current sensitivity of the galvanometer in division per $\mu \mathrm{A}$ is
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Gamma Question Bank for Engineering Physics>Chapter 17 - Current Electricity>Assignment>Q 6

In the meter bridge experiment, the null point is obtained at N. The value of unknown resistance X will be

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Gamma Question Bank for Engineering Physics>Chapter 17 - Current Electricity>Assignment>Q 7
In a potentiometer experiment, the balancing length for a cell was found to be 1.20 m. Now, a resistance of 10Ω is connected across the terminals of this cell and the balancing length becomes 80 cm. The internal resistance of this cell is
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Gamma Question Bank for Engineering Physics>Chapter 17 - Current Electricity>Assignment>Q 8
Two cells when connected in series are balanced on 6 m on a potentiometer. If the polarity of one of these cell is reversed, they balance on 2 m. The ratio of e.m.f. of the two cells is
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Gamma Question Bank for Engineering Physics>Chapter 17 - Current Electricity>Assignment>Q 9

In the potentiometer circuit shown, the galvanometer shows no deflection for AD=35 cm. The resistance of wire AB is 18 Ω And its length is 50 cm. Calculate the emf E Of the cell.

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Gamma Question Bank for Engineering Physics>Chapter 17 - Current Electricity>Assignment>Q 10

The power consumption by the circuit shown in figure at steady state is

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Gamma Question Bank for Engineering Physics>Chapter 17 - Current Electricity>Assignment>Q 11
Cell having an emf ε and internal resistance r is connected across a variable external resistance R. As the resistance R is increased, the plot of potential difference V across R is given by, 
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Gamma Question Bank for Engineering Physics>Chapter 17 - Current Electricity>Assignment>Q 12

   A cell of emf E and internal resistance r is connected to a variable external resistance. The figure shows the terminal voltage of cell with current in the circuit. The maximum power that can be delivered to the external resistance is

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