19. A solenoid of 10cm in diameter and 2.0m in length carries 25 Amperes current. It produces an internal magnetic feld of 100 mT. How many turns of wire does this solenoid have?(A) 3183；(B) 32； (C)6366； (D) 64； (E) 12732.

19. A solenoid of 10cm in diameter and 2.0m in length carries 25 Amperes current. It produces an internal magnetic feld of 100 mT. How many turns of wire does this solenoid have?
(A) 3183；
(B) 32；
(C)6366；
(D) 64；
(E) 12732.

答案：登入後查看
統計： A(2), B(1), C(0), D(0), E(0) #2740297

詳解 (共 1 筆)

助人為本

B1 · 2026/07/05

#7430899

所以這題長螺線管內部磁場只要記得這個公式就好

然後把題目給的數值代入即可

複選題22. Consider a damped harmonic oscillator, which of the following is true?(A) If it is underdamped, the resonant frequency increases with larger damping； (B) If it is underdamped, the amplitude decays faster with larger damping； (C)If it is underdamped, and is driven by an external sinusoidal force, the amplitude of the oscillation is maximum if the frequency of the force is the same as the resonance frequency； (D) In order to damp the kinetic energy and the elastic energy as fast as possible, one should design the oscillator to be at critical damping condition； (E) If it is overdamped, the system does not oscillate and returns to the equilibrium position slowly.

19. A solenoid of 10cm in diameter and 2.0m in length carries 25 Amperes current. It produces an internal magnetic feld of 100 mT. How many turns of wire does this solenoid have?
(A) 3183；
(B) 32；
(C)6366；
(D) 64；
(E) 12732.

詳解 (共 1 筆)

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