A cylindrical conductor of height 2h and radius 3b is made up of a homogenous material with conductivity . Total current passing through the conductor in axial direction is I.
a) Find the magnitude of ⃗ and inside the conductor.
b) Find the total dissipated energy in Δ time interval.

Suppose a wheel with a tire mounted on it is rotating at the constant rate of 2.15 times a second. a tack is stuck in the tire at a distance of 0.373 m from the rotation axis. noting that for every rotation the tack travels one circumference (a) find the tack's tangential speed. (b) what is the tacks radial acceleration?