Electricity and Magnetism
# Resistors

$V=115\text{ V}$ is applied across a capacitor arrangement with capacitances $C_1=10\,\mu\text{F},$ $C_2=6\,\mu\text{F}$ and $C_3=15\,\mu\text{F},$ as shown in the above figure, what is the approximate stored energy $U_3$ for capacitor 3?

If a potential difference of$V(x)$ along a copper wire as a function of position $x.$ The radius of the copper wire is $3.0\text{ mm}.$ If $V_s=11.0\,\mu\text{V}$ and $x_s=3.00\text{ m}$ in the figure, what is the approximate current in the wire?

The above figure shows the electric potentialThe resistivity of copper is $1.69 \times 10^{-8}\,\Omega\cdot\text{m}.$