Physics - Current Electricity Question with Solution | TestHub

The current density in a cylindrical wire of radius$r=4.0 \mathrm{mm}$is$1.0\times {10}^6{ \mathrm{A}}^2{ \mathrm{m}}^2$. The current through the outer portion of the wire between radial distances$\frac{r}{2}$and$r$is$x\pi \mathrm{A}$; where$x$is