In the circuit shown below,the ammeter reading is zero. Then the value of the resistance $R$ is (in $\Omega$)

In the circuit shown,what is the potential difference $V_{PQ}$?

In the following network,the current flowing through the $15\Omega$ resistance is: (in $A$)

In the given circuit,if the potential at point $B$ is $24 \ V$,the potential at point $A$ is: (in $V$)

In a Wheatstone bridge (see figure),resistances $P$ and $Q$ are approximately equal. When $R = 400 \,\Omega$,the bridge is balanced. On interchanging $P$ and $Q$,the value of $R$ for balance is $405 \,\Omega$. The value of $X$ is close to ................. $\Omega$. (in $.5$)

The equivalent resistance between $P$ and $Q$ in the given figure is ............... $\Omega$.