74. (a) The potential difference between the two ends of the caterpillar is ViRiLA===×⋅××=×−−−−ρ12169 104 0 1052 1038 1082324Ammm/2V.bgchch....Ωπ(b) Since it moves in the direction of the electron drift which is against the direction of the current, its tail is negative compared to its head.
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