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From Kirchhoff’ s loop rule
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Where C is the constant of integration. This integration constant has dimensions of current and is independent of time. Since source has an emf which oscillates symmetrically about zero, the current it sustain also oscillates symmetrically about zero, so there is no time independent component of current that exists. Thus constant C = 0 So we have
� From instantaneous values of current and voltage( equation 11 and 10) we see that in pure inductive circuit the current lags behind emf by a phase angle of π / 2
� This phase relationship is graphically shown below in the figure