Although the description of the system involves the electromagnetic potential, the physical properties only depend on the electric and magnetic field-strength.

结果表明，虽然对体系的描述涉及到电磁势，但体系的物理性质只依赖于电场和磁场的强度；

youdao

At the Earth's surface, these tempests can be detected by changes in the strength of the Earth's magnetic field.

在地球表面，可以通过改变地球磁场强度来检测这些风暴。

youdao

These magnetic forces are monstrous when compared with the magnetic field strength of our planet — which measures in at less than 1 gauss at the Earth's surface.

比起地球表面上不到1高斯的的磁场强度这些磁场大的惊人。

youdao

Mr Wechlin adds that, during charging time, people stay inside the buses - something he says is absolutely safe, as the strength of the magnetic field produced is within the limits recommended by the International Commission on non-ionizing radiation protection (ICNIRP).

BBC: Wireless charging - the future for electric cars?

Moreover, there is (controversial) evidence of a long-term weakening trend in the magnetic field strength of sunspots.

FORBES: To The Horror Of Global Warming Alarmists, Global Cooling Is Here