There’s no question what Wall Street thinks about Motorola’s new co-chief executive, Sanjay Jha. The communications conglomerate’s shares jumped 11 percent to nearly $10 on Aug. 4 after announcing the former Qualcomm chief operating officer would take the reins of Motorola’s mobile-phone business. Jha brings loads of industry experience and extensive familiarity with wireless investors, ending the Schaumburg, Ill., company’s five-month search for an executive to head the troubled cell-phone unit.