For the determination of emf $E$ and internal resistance $\text{'}r\text{'}$ of a cell, the graph is obtained between potential difference $V$ between the terminal of the cell against the current $I$, which was changed by adjusting the rheostat, is as shown. The internal resistance of the cell is

The current flowing through the cell in the circuit shown is

The equivalent resistance between $A$ and $B$ in the network shown in figure is

The equivalent resistance between $A$ and $B$ in the situation shown is

The resistance between the terminal points $A$ and $B$ of the given infinitely long circuit will be

The effective resistance between $A$ and $B$ in the network shown is

Calculate the net resistance between $A$ and $B$

In the circuit shown, the value of $R$ in $\Omega$ for which no current flows through the $5 \mathrm{V}$ battery, is_______