The figure shows a network of five resistances and two batteries. The current through the $30\,V$ battery is ............... $A$.

In the following network,$I_{1} = -0.4 \text{ A}$,$I_{4} = 1 \text{ A}$ and $I_{5} = 0.4 \text{ A}$. The values of $I_{2}$,$I_{3}$ and $I_{6}$ respectively are:

In a Wheatstone bridge,$P = 9 \, \Omega$,$Q = 11 \, \Omega$,$R = 4 \, \Omega$,and $S = 6 \, \Omega$. How much resistance $r$ must be connected in parallel to the resistance $S$ to balance the bridge?

In a Wheatstone bridge circuit where the four arms have resistances $P, Q, R,$ and $S$ arranged in order, if the bridge is balanced, the potential difference between the two mid-points $A$ and $B$ (where the galvanometer is connected) is .............. $V$.

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

If the potential difference between points $B$ and $D$ is zero in the given circuit, the value of $x$ is $1/n \text{ } \Omega$. The value $n$ is