He realized that he’d been looking for the wrong thing: a constant magnetic field didn’t cause an electric current in a loop of wire.

他意识到他一直在寻找错误的东西：恒定的磁场不会在电线环中产生电流。

He realized that he'd been looking for the wrong thing: a constant magnetic field didn't cause an electric current in a loop of wire.

恒定的磁场不会在导线环中产生电流。