15.如【圖 15】所示之電路,若β=100,則 IB與 VE約為多少?(A) IB = 20μA,VE = 0V(B) IB = 20μA,VE = 2V(C)IB = 10μA,VE = −1V(D)IB = 10μA,VE = 1V