11. 感應電動勢 \(\varepsilon\) 與磁通量 \(\Phi_B\) 的關係為
(A) \(\varepsilon = \frac{d\Phi_B}{dt}\)
(B) \(\varepsilon = -\frac{d\Phi_B}{dt}\)
(C) \(\frac{d}{dt}\varepsilon = \Phi_B\)
(D) \(\frac{d}{dt}\varepsilon = -\Phi_B\)

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