This question asks to find R(net) for 2 cases: Switch Open & Switch Closed.

Switch Open case is straight-forward. We just need to apply star-delta transformation.

But how to solve when Switch is closed.

Please try to solve and share your answer. I need it. Thanks.

 

This question asks to find R(net) for 2 cases: Switch Open & Switch Closed.

Switch Open case is straight-forward. We just need to apply star-delta transformation.

But how to solve when Switch is closed.

Please try to solve and share your answer. I need it. Thanks.

By, "Please try to solve and share your answer. I need it," you pretty clearly mean, "Do my homework for me and give it to me so that I can turn your work in as my own and claim credit for it."

Sorry, doesn't work that way.

YOU need to show YOUR best attempt to work YOUR homework problems.