A potential difference of $5 \mathrm{V}$ is applied across a conductor of length $0.1 \mathrm{m}$. If the electron mobility is $5\times {10}^{-6}{ \mathrm{m}}^2{\mathrm{v}}^{-1}{\mathrm{s}}^{-1}$ then the drift velocity of electron is

The potential difference through the $3 \mathrm{\Omega }$ resistor shown in the figure is

In the circuit given below, it is observed that the current $I$ is independent of the value of resistance $r_6$. Then the resistance values satisfy

In the given circuit, the value of current $i_2$ is,