In a Wheatstone bridge,$P = 90\,\Omega$,$Q = 110\,\Omega$,$R = 40\,\Omega$,and $S = 60\,\Omega$. $A$ cell of $4\,V$ emf is connected across the input terminals. The potential difference between the diagonal points $B$ and $C$ (where the galvanometer is connected) is ............. $V$.

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.

The electric current $i$ in the circuit shown is (in $\text{ A}$)

The currents in different parts of the electric circuit are shown in the following figure. The value of current $i$ is (in $\text{ A}$)

Find the equivalent resistance between points $A$ and $B$ for the given circuit.

In the figure shown,the current in the $10 \, V$ battery is close to