The S&P 500 and Nasdaq fell on Thursday, with the biggest drag from Apple and weakness in chip stocks over concerns about China's iPhone curbs, while a fall in weekly U.S. jobless claims fed worries about interest rates and sticky inflation. S&P heavyweight Apple was on track for its second straight day of losses, down 3.5%, after news China widened curbs on iPhone use by state employees, requiring staff at some central government agencies to stop using their mobiles at work. Bloomberg reported that China planned to broaden the iPhone ban to state firms and agencies. The drag from Apple,...