The figure shows a network of currents. The magnitude of currents is shown in the figure. The current $I$ will be ........... $A$.

In the following diagram,the Wheatstone bridge is balanced when we interchange the resistances of:

Resistances are joined as shown in the figure. In the balanced condition, the current $I$ drawn from the battery is (in $\text{ A}$)

Two cells of voltage $10 \ V$ and $2 \ V$ and internal resistances $10 \ \Omega$ and $5 \ \Omega$ respectively,are connected in parallel with the positive end of $10 \ V$ battery connected to the negative pole of $2 \ V$ battery (figure). Find the effective voltage and effective resistance of the combination.

Calculate the current in wire $BD$ in the given circuit. (in $, A$)

The effective resistance between points $A$ and $B$ is ............... $\Omega$.