31. Determine 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)

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統計: A(8), B(3), C(1), D(1), E(0) #3222798

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#6064799
答案 (A)
51. An infinite long wire is charged uniformly with line charge density λ. What is the electric field at a point with a distance y from the stick? (Electric constant is ε0)
(A) 62e3800a81f21.jpg#s-46,69
(B) 62e38010e5f03.jpg#s-58,67
(C) 62e38017901b2.jpg#s-75,72
(D) 62e3801daf999.jpg#s-30,68
(E) 62e38024523bc.jpg#s-34,72
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