In the circuit shown in the figure,when no current flows through the $5\,\Omega$ resistor,the value of the resistor $X$ will be ........... $\Omega$.

For the given circuit,the reading of the ammeter in amperes is........

In the balanced condition,the values of the resistances of the four arms of a Wheatstone bridge are shown in the figure below. The resistance $R_3$ has a temperature coefficient of $0.0004 \ {}^{\circ}C^{-1}$. If the temperature of $R_3$ is increased by $100 \ {}^{\circ}C$,the voltage developed between $S$ and $T$ will be. . . . . . . volt.

Kirchhoff's junction law represents the conservation of which physical quantity?

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

When the value of $R$ in the balanced Wheatstone bridge,shown in the figure,is increased from $5 \Omega$ to $7 \Omega$,the value of $S$ has to be increased by $3 \Omega$ in order to maintain the balance. What is the initial value of $S$ (in $Omega$)?