当磁场围绕着带电导线时会有很有趣的现象发生，通常所用的电流产生的磁场相当的弱，最多可以使指南针的指针发生偏转。

While the magnetic field surrounding a current-carrying wire is indeed interesting, it is quite weak for common amounts of current, able to deflect a compass needle and not much more.

youdao

当磁场围绕着带电导线时会有很有趣的现象发生，通常所用的电流产生的磁场相当的弱，最多可以使指南针的指针发生偏转。

While the magnetic field surrounding a current-carrying wire is indeed interesting, it is quite weak for common amounts of current, able to deflect a compass needle and not much more.

youdao