The new chairman of the Federal Communications Commission, Michael K. Powell, yesterday told a House panel that he aims to spare the industries he regulates from an excess of rules, allowing market forces to largely determine the shape of the telecommunications, broadcasting and Internet industries. Powell also called for a reexamination of the rules governing the broadcasting industry, whose lobby is among the most powerful in Washington. He said he plans to launch a formal proceeding in May to lift a long-standing ban on a single company owning a newspaper and a television station in the same market. He also plans to pursue lifting rules that bar a single company from owning television stations that reach more than 35 percent of the national market, asserting that the cap dates back three decades to "an entirely different media environment."