6. In the circuit, if the switch S is closed for a long time, and is then opened. Just after the switch is opened, what is the potential difference across the inductor L?
(A) ε
(B) 
(C) 
(D)
(E)
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統計: A(0), B(0), C(1), D(0), E(0) #3239286
統計: A(0), B(0), C(1), D(0), E(0) #3239286