$26.$ The current through a conductor is modeled as

I$($t$)=$ Im sin $(2$$[60$ Hz$]$t$).$ Write an equation for the

charge as a function of time.

is Ri $=0\mathrm{.}20$ mm and the outer radius is R$0=0\mathrm{.}30$ mm $.$

The length of the resistor is L $=0\mathrm{.}90$ mm $.$ The resistivity

of the carbon is $=3\mathrm{.}5105$ m $.($a$)$ Prove that the

resistance perpendicular from the axis is R $=$

$2$Lln$$

R$0$

Ri

$.$

$($b$)$ What is the resistance?