When a pure capacitive load or zero power factor leading load is connected across the terminals of the alternator, the current in armature winding will lead the induced e.m.f. by 90°. So the armature flux will be in phase with the main field flux, resulting in strengthening of the field flux causing the magnetizing effect. But for any intermediate power factor, the effect of armature reaction will be partly distorting and partly demagnetizing.