【简答题】A current-carrying gold wire has diameter 0.84 mm. The electric field in the wire is 0.49V/m. The current carried by the wire equals A. (The resistivity of gold is 【图片】) (Be accurate to two deci...
【单选题】The resistivity of a 1.0 m long wire is 1.72 × 10-8 Ωm and its cross sectional area is 2.0 × 10-6 m2. If the wire carries a current of 0.20 A, what is the voltage across the wire?