12. The figure shows six charged rods. Some have the same sign charge throughout and are uniformly charged. The rest have one sign on one half and the opposite sign on the other half, with each half uniformly charged. For each rod, a point P on a perpendicular bisector is indicated. In which situation is the net electric field at P in the positive direction of the y axis?

(A) 2 and 5,
(B) 2 and 6,
(C) 4 and 5,
(D) 1 and 4,
(E) 3 and 5.

(A) 2 and 5,
(B) 2 and 6,
(C) 4 and 5,
(D) 1 and 4,
(E) 3 and 5.
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統計: A(0), B(0), C(0), D(0), E(1) #3332071
統計: A(0), B(0), C(0), D(0), E(1) #3332071
詳解 (共 2 筆)
#7399193
所以解這題十分的簡單就是
記住一個原則就是
正電荷遠離它,負電荷靠近它
所以所造成的即為合力方向
所以答案為e
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