問題詳情
(14)Helmholtz coils are sometimes used to obtain a nearly uniform magnetic field in situations where a solenoid would be impractical as shown in the right figure. The magnetic field at the center point on the axis, midway between the coils, how about the derivative of B?
(A)B(x) ≈ B₀ + B'(0)x
(B)B(x) ≈ B₀ + B''(0)x²
(C)B(x) ≈ B₀ + B'''(0)x³
(D)B(x) ≈ B₀ + B''''(0)x⁴
(E)B(x) ≈ B₀ + B'''''(0)x⁵
參考答案
答案：D
統計：A:0,B:0,C:0,D:0,E:0
難度：計算中