Which of the following represents a pure inductive reactance in polar coordinates?
A positive 45 degree phase angle
A negative 45 degree phase angle
A positive 90 degree phase angle✓پاسخ درست
A negative 90 degree phase angle
توضیح
A pure inductance has no resistive component, so its impedance vector lies entirely along the positive imaginary direction. That corresponds to an angle of +90 degrees; −90 degrees would be pure capacitive reactance.