Top row: total magnetic energy (ME) minus the initial value as a function of time for a) Case 1 (black solid curve) and Case 2 (red dashed curve); b) Case 3 (black solid curve) and Case 4 (red dashed curve). The total magnetic energy in the volume at time t = 0 is 175.52 for Case 1 and Case 2 and 174.52 for Case 3 and Case 4. Bottom row: temporal evolution of the total internal energy (INT) for c) Case 1 (black solid curve) and Case 2 (red dashed curve); d) Case 3 (black solid curve) and Case 4 (red dashed curve).