A long caterpillar of 4.00 cm crawls in the direction of the electron drift all along a 5.20 mm diameter bare copper wire which carries a current of around 12.0 A. Suppose that the resistivity of copper is around 1.673 × 10^-8 O*m. The drift speed of the electrons is around 0.0422 mm/s.
(i) Determine the potential difference among the two ends of the caterpillar?
(ii) Is its tail negative or positive compared to its head?
(iii) Determine how much time could it take the caterpillar to crawl 1.00 cm and still keep up by the drifting electrons in the wire?