一些人担心电源线的电磁场可能增加患癌症的风险。
Some people are worried that electromagnetic fields from electric power lines could increase the risk of cancer.
太阳黑子是磁场的事实解释了它们的黑色外观。
The fact that sunspots are magnetic fields accounts for their dark appearance.
天文学家最终确实发现了太阳黑子与磁场的关系。
Astronomers did eventually figure out what sunspots had to do with magnetic fields.
地磁活动是地球磁场的自然变化，其波动周期为11年。
Geomagnetic activity, the natural variations in Earth's magnetic field, it fluctuates in 11-year cycles.
“信使号”将探索水星的表面、地壳、大气，甚至其磁场。
Messenger will explore the surface of Mercury, its crust, its atmosphere and even its 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。
At the Earth's surface, these tempests can be detected by changes in the strength of the Earth's magnetic field.
当磁场最强，太阳黑子最丰富的时候，它们会聚集在赤道附近。
When the magnetic field is at its strongest, and sunspots at their most plentiful, they cluster close to the equator.
这个磁体创建一个磁场，能改变覆盖在磁盘表面的小金属粒子的极性。
The magnet creates a field that changes the polarity of a tiny, tiny portion of the metal particles which coat each platter's surface.
这种金属核赋予地球特有的磁场，在地球的历史上发挥了极其重要的作用。
This metallic core gives Earth its characteristic magnetic field, which has played an extremely important role in the history of our planet.
显然，试图解释和预测磁场变化的地球物理学家必须了解外核发生了什么。
Clearly, geophysicists who seek to explain and forecast changes in the field must understand what happens in the outer core.
考古学家们还可能利用地面雷达、磁场记录和金属探测器等技术来定位被掩埋的遗骸。
Archaeologists also may locate buried remains by using such technologies as ground radar, magnetic-field recording, and metal detectors.
地球磁场是由地球外核的熔铁围绕固体内核旋转而产生的；当铁水激增，就会发生磁暴。
The Earth's magnetic field is generated as the molten iron of the Earth's outer core revolves around its solid inner core; when surges in the molten iron occur, magnetic tempests are created.
这是因为磁场降低了施加在内部气体上的压力，使得太阳黑子比太阳表面的其他部分温度更低。
That's because magnetic fields reduce the pressure exerted on the gases inside of them, making the spots cooler than the rest of the Sun's surface.
1832年，也就是迈克尔·法拉第发现磁场变化会产生电场的那一年，一位年轻的法国工程师为一种新的、效率更高的水车申请了专利。
In 1832, the year of Michael Faraday's discovery that a changing magnetic field produces an electric field, a young French engineer patented a new and more efficient waterwheel.
首先确定寻星镜磁场的大小。
开始时没有磁场，它不喜欢改变。
磁场唯一的来源就是电荷和电流。
The only magnetism comes from electric charges and currents.
它不是使用风压，而是磁场。
举个例子，磁场就不是梯度。
因为磁场由北至南变化很大。
磁场可以无害地穿过人体。
Magnetic fields can pass through the human body without harming anything.
然而直接探测其它恒星的磁场是很困难的。
Directly detecting the magnetic fields of other stars, however, can be difficult.
这说明，我们可能通过某种方式看到磁场。
Which suggests we might be able to see magnetic fields in some way.
地球的磁场如何产生？
磁星是一类磁场比地球磁场强千亿倍的中子星。
Magnetars are a type of neutron star which has a magnetic field a million billion times stronger than the Earth's.
电和磁场系由诸如地球磁场、雷暴和使用电等现象产生。
Electric and magnetic fields are generated by phenomena such as the Earth's magnetic field, thunderstorms, and the use of electricity.
然后，用第二个磁场短时轰击这些原子核，使其脱离第一个磁场阵列。
These nuclei are then zapped briefly with a second magnetic field that knocks them out of alignment with the first one.
在心脏上方平置一个大线圈，传感器使线圈产生磁场，磁场为接受器供电。
That is because the transmitter USES a large flat coil, placed over the heart, to generate the magnetic field that powers the receiver.
电容产生电场，线圈生成磁场，电路中的能量就在电场和磁场之间高速振荡。
The energy within this circuit oscillates rapidly between an electric field in the capacitor and a magnetic field in the coil.
电容产生电场，线圈生成磁场，电路中的能量就在电场和磁场之间高速振荡。
The energy within this circuit oscillates rapidly between an electric field in the capacitor and a magnetic field in the coil.
应用推荐