15. There is a current I passing through an inductor with inductance L. How much energy is stored in the inductor? (A) (B) (C) (D) (E)

15. There is a current I passing through an inductor with inductance L. How much energy is stored in the inductor?
(A)
(B)
(C)
(D)
(E)

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詳解 (共 1 筆)

助人為本

B1 · 2026/07/16

#7445931

所以這題可以直接記公式

也可以稍微推導一下

所以電容器的電位能公式=1/2CV^2

電感器的電位能公式=1/2LI^2

ㅤㅤ

推導的話

V=L*di/dt

P=IV

P=LIdi/dt

P=dU/dt

dU=LIdi

所以U微小積分可以得到上面的公式

16. Consider two observers A and B sit on two trains Tₐ and TB, respectively. These two trains have the same proper length. If Tₐ stays in a station and TB moves with a velocity v with respect to the station. When they overlap in the station, which one of the following statements is correct? (A) The observer A finds that Tₐ is shorter than TB, but the observer B finds that TB is shorter than Tₐ. (B) The observer A finds that TB is shorter than Tₐ, but the observer B finds that Tₐ is shorter than TB. (C) Both A and B find that Tₐ is shorter than TB. (D) Both A and B find that TB is shorter than Tₐ. (E) Both A and B find that TB and Tₐ have the same length.

15. There is a current I passing through an inductor with inductance L. How much energy is stored in the inductor?
(A)
(B)
(C)
(D)
(E)

詳解 (共 1 筆)

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