An iron cylinder with a length L = 10 cm and a radius r = 1 cm is placed inside a long solenoid through which an alternating current with a frequency n = 50 Hz is passed. The current reverses the magnetization of the cylinder from -Vus to Vus and then from Vus to -Vus. The axes of the solenoid and the iron cylinder are parallel. The hysteresis loop of this sample can be approximated by a rectangular curve shown in the figure. Calculate how much heat is released in the core during the time Dt = 1 min.

Answer. Format gif