question_answer

Following figure shows an ac generator connected to a "black box" through a pair of terminals. The box contains possible R, L, C or their combination, whose elements and arrangements are not known to us. Measurements outside the box reveals that \[e=75\sin (\sin \omega t)\]volt, \[i=1.5\sin (\omega t+45{}^\circ )\] amp, then the wrong statement is

A)  There must be a capacitor in the box               

B)  There must be an inductor in the box

C) There must be a resistance in the box               

D) The power factor is \[0.707\]