26.A 16-nC charge is distributed uniformly along the x axis from x = 0 to x = 4 m. Which of the following integrals is correct for the magnitude (in N/C) of the electric field at x = +10 m on the x axis? The Coulomb constant is 9.0 × 109 N · m2 / C2.
(A)
(B)
(C)
(D)
(E) none of these.
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統計: A(1), B(2), C(0), D(1), E(0) #3427026
統計: A(1), B(2), C(0), D(1), E(0) #3427026