Which of the following represents a pure inductive reactance in polar coordinates?

In polar coordinates, alternating current impedances are represented by a magnitude and a phase angle. The phase angle defines the timing relationship between voltage and current. In a purely inductive circuit, the voltage leads the current by exactly 90 degrees, which translates to a positive 90-degree phase angle. Conversely, a pure capacitive reactance causes the current to lead the voltage by 90 degrees, resulting in a negative 90-degree phase angle. Angles like 45 degrees, whether positive or negative, indicate a mixture of resistance and reactance rather than a "pure" reactive state.