An a. c. source is connected across a pure inductor. Which one of the following figures shows the correct phase relation between the current and e.m.f.?

Step-by-step solution

In an ideal inductor driven by an alternating current source, the voltage leads the current by a phase difference of 2 radians (or 90^ ), or equivalently, the current lags the voltage by 90^ . Analysis by elimination: Option (A) depicts a 180^ phase shift, which is incorrect. Option (B) shows the voltage along the positive x-axis and the current along the negative y-axis; hence, voltage leads current by 90^ . Option (C) shows zero phase difference, characteristic of a resistive circuit. Option (D) illustrates curre