Final answer:
The source current in the circuit is -3.50 A after the currents have reached steady-state values and the switch is reopened. Initially, the source current is 1.56∠ -55° A.
Step-by-step explanation:
The circuit shown in the question consists of an inductor and a switch, with an initial current given as o = 1.56∠ -55° A. To determine the source current, we need to consider the behavior of the circuit at different times. When the switch is closed, the inductor current increases. After a long time, when the currents have reached steady-state values, the source current will be the same as the inductor current, which is -3.50 A. If the switch is reopened after a long time, the source current will return to its initial value of 1.56∠ -55° A.