In the given circuit,the value of $i$ is ........... $A$.

See the electrical circuit shown in the adjoining figure. Which of the following equations is a correct equation for it?

$A$ non-zero current passes through the galvanometer $G$ shown in the circuit when the key $K$ is closed and its value does not change when the key is opened. Then, which of the following statement$(s)$ is/are true?

The potential difference between points $C$ and $D$ of the electrical circuit shown in the figure is (in $V$)

The figure shows a network of four resistances and three batteries. The current through the branch $CF$ is ............... $A$.

What are the advantages of the null-point method in a Wheatstone bridge? What additional measurements would be required to calculate $R_{\text{unknown}}$ by any other method?