Two bars of equal resistivity $\mathrm{\rho }$ and radii $r$ and $2r$ respectively are kept in contact as shown in the figure below. An electric current $I$ is passed through the bars. Which one of the following is correct? 

 

Figure shows three resistor configurations$R_1, R_2$ and $R_3$ connected to $3 \mathrm{V}$ battery. If the power is dissipated by the configuration $R_1, R_2$ and $R_3$ is $P_1, P_2$ and $P_3$, respectively, then

STATEMENT -1: In a Meter Bridge experiment, null point for an unknown resistance is measured. Now, the unknown resistance is put inside an enclosure maintained at a higher temperature. The null point can be obtained at the same point as before by decreasing the value of the standard resistance.
and

STATEMENT -2: Resistance of a metal increases with increase in temperature.

For the circuit shown in the figure.

Consider a thin square sheet of side $L$ and thickness $t$, made of a material of resitivity $\mathrm{\rho }$. The resistance between two opposite faces, shown by the shaded areas in the figure is: 

For the resistance network shown in the figure, choose the correct option(s).