問題詳情
31.tDetermine tiie correct unit and magnitude of the electric field at distance x from the midpoint of a
very long line of unifonnly distributed positive charge. Assume x is much smaller then the length of
the wire, and let λ be the charge par unit length.
(A)
(B)
(C)
(D)
(E)
參考答案
答案：A
統計：A:1,B:0,C:0,D:0,E:0
難度：計算中