A 1 k VA, 230 V/ 100V, single phase, 50 H z transformer having negligible winding resistance and leak age induct ance i s oper at ing under saturation, while 250V, 50 Hz sinusoidal supply is connected to the high voltage winding. A resistive load is connected to the low voltage winding which draws rated current. Which one of the following quantities will not be sinusoidal?