Ending speculation that he might appoint a new central bank chief, President Obama said he would nominate Fed Chairman Ben Bernanke for a second term Tuesday as the administration continues its efforts to stabilize the embattled U.S. economy.

A year after Wall Street went into a tailspin, the Fed continues to take unprecedented steps to revive the economy. David Wessel has penned a book about Ben Bernanke and the changing role of the Fed. He answered questions in…