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 that e = 75 sin (sin omega t) volt, i = 1.5 sin ( omega t + 45o) amp then, the wrong statement is

Since voltage is lagging behind the current, so there must be no inductor in the box. 

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