In the given circuit,if no current flows through the ammeter,what is the value of $X$ in $\Omega$?

In a balanced Wheatstone's network,the resistances in the arms $Q$ and $S$ are interchanged. As a result of this:

$A$ battery of $10 \;V$ and negligible internal resistance is connected across the diagonally opposite corners of a cubical network consisting of $12$ resistors each of resistance $1 \;\Omega$. Determine the equivalent resistance of the network and the current along each edge of the cube.

For the network shown in the figure,the value of the current $i$ is:

Calculate the equivalent resistance between $A$ and $B$.

Find the value of current $I$ in the given circuit. (in $,A$)