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若导线中单位长度自由电子数为n.自由电子电量为e,自由电子定向运动速度为v.则导线中电流强度为(L为导线长度),这一关系式在高考试题中常会用到.
If the number of free electrons per unit length in the wire is n. The free electron charge is e, and the free electron velocities are v. Then the current in the wire is (L is the length of the wire). This relation is often used in high test questions.