起步实验：探究变化磁场中发生的现象？
霍耳磁强计可测量稳恒磁场及随时间变化磁场。
Hall magnetometer can be used to measure stable magnetic field and the magnetic field changing with time.
更精确地说，电势产生电场，这一观点是错误的，如果忽略变化磁场的存在的话。
More precisely it tells you that what you might have learned about electric fields deriving from electric potential becomes false if you have a variable magnetic field.
磁刺激是利用变化磁场产生的感应电场作用于可兴奋人体组织的过程。
The magnetic stimulation is the process that the excitable human tissue is acted with the electric field induced by the changing magnetic fields.
可任意调节电磁线圈匝数，匝间距离，产 生频率变化磁场分布变化。
The advantages lie in that the electromagnetic coil turns and turn-to-turn distance can be randomly regulated to generate frequency changes and magnetic field distribution changes.
磁性颗粒能在时间变化磁场中产生共振响应，因而能很好地将能量从激发场转移到纳米颗粒中。
Magnetic particles also can have resonant response to a time-varying magnetic field with advantageous results related to the transfer of energy from the exciting field to the nanoparticles.
从全球磁场减去地核主磁场和变化磁场及其感应磁场后，就得到岩石圈磁场，又称地壳磁场，或地磁异常。
The crust magnetic field, or lithospheric magnetic field, can be deduced by subtracting the main field, variation field and its induced counterpart from the total field.
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.
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.
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.
这一传递中的变化使得研究人员可以同时找到磁场的大小和方向。
This change in transmission allowed the researchers to find the size and direction of the magnetic field at the same time.
地球磁场不同的变化会造成它们不同的自旋方式，每种方式都会让罗盘的化学状态表现出细微的差异。
Variations in Earth’s magnetic field cause them to spin in different ways, each of which leaves the compass in a slightly different chemical state.
当孩子的大脑回应每种声音时，脑磁图描记术机器中的非侵入性探测器就会分析大脑中变化的磁场。
As the child's brain responds to each sound, non-invasive detectors in the MEG machine analyse the brain's changing magnetic fields.
其高温的原因至今是个未解之谜，但是人们认为这是与联通太阳的等离子体的快速变化的磁场循环有关。
The reason for the high temperatures is unknown but thought to be related to the rapidly changing magnetic field loops that channel solar plasma.
也许它们感受磁场变化速度的细微变化，就像登山旅行者参照地形图上密密麻麻的线段以辨别一个与众不同的峡谷。
Maybe they sense slight variations in the rate of change in the magnetic field, much like a hiker reads tightly spaced lines on a topographic map to discern a distinctive canyon.
海龟利用地球磁场的变化分辨南北方位，从而指引自己沿正确的纬度迁徙，这对科学家来说并不陌生。
Scientists already knew that the creatures used changes in Earth’s magnetic field to help them tell north from south and steer themselves along the right latitude.
几年前殷亚东做了这样一个实验：当对微珠施加一个磁场压力时，珠子的颜色起了变化。
A FEW years ago Yadong Yin was experimenting with tiny beads that changed colour when a magnetic field was applied to them.
海龟利用地球磁场的变化分辨南北方位，从而指引自己沿正确的纬度迁徙，这对科学家来说并不陌生。
Scientists already knew that the creatures used changes in Earth's magnetic field to help them tell north from south and steer themselves along the right latitude.
这和以前不同了，如果存在一个变化的磁场,穿过金属线圈,线圈内就会产生一个电压。
Well,a small change in plans.If you actually have a varying magnetic field that passes through that wire then that will actually generate voltage in it.
传感器成功探测到心跳所伴随的微弱而规则的磁场变化。
The sensor successfully detected the weak but regular magnetic pattern of the heartbeat.
他同时认识到，变化电场强度将会产生一个变化的磁场，甚至在一个没有移动电子的空间中也是如此。
He also realised that varying the strength of an electric field would generate a changing magnetic field, even in empty space with no moving electric charges to speak of.
当然一个变化的磁场会产生电场，就像法拉第做的那样。
A changing magnetic field, of course, gives rise to an electric field, as had been established by Faraday.
磁场的变化是像太阳这样的恒星表面黑子活动周期的根源，尽管经过几十年的认真研究之后，地球人仍然对其知之甚少。
The magnetic activity of stars like sun, which is the root cause of the sunspot cycle, is still poorly understood even after decades of intense study.
扫描仪上的线圈探测到这些磁场变化，并以此构建出患者受检部位的图谱。
The coils in the scanning apparatus detect these magnetic changes, which are used to build up a map of the part of the body being examined.
地球物理学家很早就知道，地球磁场变化的原因深藏于地球中心。
Geophysicists have long known that the source of the fluctuating magnetic field lies deep in the center of the earth.
他们还用各种各样的仪器和方法，通过测量地震前发生的地球物理上的变化，如地表倾斜度和活性断层附近的磁场变化，对地震进行预测。
These instruments measure tilts int the ground's surface, as well as changes in the magnetic field near active faults . Usually these changes precede the occurrence of some earthquakes.
地球的磁场在其它方面也在处于变化中——全球的磁场强度在19世纪后减弱了10%。
Earth's magnetic field is changing in other ways, too - globally, the magnetic field has weakened 10 percent since the 19th century.
地球的磁场在其它方面也在处于变化中——全球的磁场强度在19世纪后减弱了10%。
Earth's magnetic field is changing in other ways, too -globally, the magnetic field has weakened 10 percent since the 19th century.
我们就不纠结这种情况了，这个方程告诉你，如果磁场随时间变化，它就会无中生有地产生电场。
But let's not bother.Again, what this equation tells you is that if the magnetic field changes over time then it creates, just out of nowhere, and electric field.
由于磁场变化对普通金属只会造成远远不到百份之一的电阻变化，这种现象被称为“巨磁电阻”或巨磁阻gmr。
Since a magnetic field changes the resistance of ordinary metals by only a fraction of a percent, they dubbed this phenomenon "giant magnetoresistance," or GMR.
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