In the diagram resistance between any two junctions is $R$. Equivalent resistance across terminals $A$ and $B$ is

 

The diagram besides shows a circuit used in an experiment to determine the emf and internal resistance of the cell $C$. A graph was plotted of the potential difference $V$ between the terminals of the cell against the current $I,$ which was varied by adjusting the rheostat. The graph is shown on the right; $x$ and $y$are the intercepts of the graph with the axes as shown. What is the internal resistance of the cell?

A battery is of emf $E$ is being charged from a charger such that positive terminal of the battery is connected to terminal $A$ of charger and negative terminal of the battery is connected to terminal $B$ of charger. The internal resistance of the battery is $r$.

A battery of emf $E$ and internal resistance $r$ is connected across a resistance$R.$ Resistance $R$ can be adjusted to any value greater than or equal to zero. A graph is plotted between the current $\left(i\right)$ passing through the resistance and potential difference $\left(V\right)$ across it. Select the correct alternative.

 Two identical fuses are rated at $10\mathrm{A}$. If they are joined 

The value of the resistance $R$ in figure is adjusted such that power dissipated in the $2\Omega$ resistor is maximum. Under this condition