Four resistors are connected as shown in the figure. It is found that the current flowing through the galvanometer $G$ is zero. The resistance of $R$ is

In the circuit shown in the figure, the current flowing in $2 \mathrm{\Omega }$ resistance is

The effective resistance between points $A$ and $\mathrm{B}$ is

Figure (i) drawn below shows how four resistors are connected. A $6 \mathrm{V}$ cell is connected between points $\mathrm{P}$ and $\mathrm{R}$. If the cell has negligible internal resistance, the P.D. between points $\mathrm{Q}$ and $\mathrm{S}$ is

Five identical resistors each of resistance $1 \mathrm{\Omega }$ are initially arranged as shown in the figure by dark lines. If two similar resistances are added as shown by the dashed lines, then change in resistance in final and initial arrangement is

The figure shows a circuit diagram of a Wheatstone bridge to measure the resistance $G$ of the galvanometer. The relation $\frac{P}{Q}=\frac{R}{G}$ will be satisfied only when

Thirteen resistances each of resistance $R \mathrm{\Omega }$ are connected in the circuit, as shown in the following figure. The effective resistance between $A$ and $B$ is

Find the equivalent resistance across the terminals of e.m.f. source of $24 \mathrm{V}$ for the circuit shown in figure