A current of $5 \mathrm{A}$ is passing through a metallic wire of cross-sectional area $4\times {10}^{-6} {\mathrm{m}}^2$. If the density of the charge carriers in the wire is $5\times {10}^{26} {\mathrm{m}}^{-3}$, the drift velocity of the electron is,

A current of $3 \mathrm{A}$ flows through a wire shown in figure. The potential difference between points $A$ and $B$ is,

Five resistances $10 \mathrm{\Omega }\text{,} 20 \mathrm{\Omega }\text{,} 20 \mathrm{\Omega }\text{,} 40 \mathrm{\Omega }$ and $50 \mathrm{\Omega }$ are connected as shown in figure. The equivalent resistance between points $A$ and $B$ is,

The equivalent resistance between points $x$ and $y$ will be,