Q. Following figure shows an ac generator connected to a “block 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 t $e = 75\sin{(\sin{\omega t})}volt,$ $i = 1.5\sin{(\omega t + 45{^\circ})}amp$. 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
Explanation
(b) Since voltage is lagging behind the current, so there must be no inductor in the box
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.