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) \(\frac{d}{dt}\varepsilon = -\Phi_B\)