Is it permissible to look at a woman's hair or arm on television? And what should a man do if he is compelled to speak with uncovered women; should he lower his gaze or turn away from them?

It is not permissible to look at a woman who is displaying her adornments (mutabarrijah), whether directly or via television. If you need to speak with a mutabarrijah woman, you must not be alone with her, you must lower your gaze from her, and you should advise and guide her to wear the hijab. If you fear falling into temptation, then turn away from her and do not speak with her.