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.
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.
自那以后，好几支试验队伍一直在想方设法生成温度较低的反氢原子，并使用巧妙配置的电场和磁场留住它。
Since then several teams have been trying to make colder antihydrogen and to hold on to it using clever configurations of electrical and magnetic fields.
那时因为光是以一种电磁辐射的形式存在的——换句话说，光就是一种波，在这种波里，电场与磁场不断地相互进行着交替作用。
That is because light is a form of electromagnetic radiation—in other words, a wave in which electric and magnetic fields continuously leapfrog each other.
他们指出，电场将被限制在天花板附近，因而只有磁场可将电能传送至几米开外的一个更小的接收线圈。
They showed that the electric field is confined near the ceiling, leaving only the magnetic field to transfer the energy to a smaller receiving loop a few metres away.
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.
为了测出如此微小的力，国家标准和技术学会的团队将大约60个超冷铍离子装在一个叫做“潘宁陷阱”的装置中，该装置是利用磁场和电场禁锢带电粒子的。
To detect such a tiny force, the NIST team confined about 60 ultra-cold beryllium ions in a device called a Penning trap, which USES magnetic and electric fields to imprison charged particles.
由于采用磁场而不是电场，所以这项技术不会给人带来危险。
This technology is not dangerous to humans since it use magnetic fields to transmit energy and not electric fields.
事实上，如果从原点观察，由一个带点粒子产生的电场，其方程与上述方程是一样的，类似的例子还有磁场等等。
Actually, if you look at the electric field generated by a charged particle at the origin, it is given by exactly the same kind of formula, and there are magnetic fields and so on.
该技术带来的一项好处是可以相对快速地检测到微弱的电场和磁场。
One of the benefits of this technique is that it allows for a relatively rapid detection of tiny electric and magnetic fields.
如果有一个电流通过线圈，并激发出磁场，相应的，根据另一个方程激发出电场，并产生电流。
If you have a current passing in the loop that causes a magnetic field and, in turn, for the other equation that causes an electric field, which in turn causes a current.
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.
其中一项指出电场和磁场是怎样由电荷和电流产生的，另一项指出磁场的缺失并不是由电流产生的。
One of them describes how electric and magnetic fields are generated by electric charges and their currents. The other describes the absence of magnetic fields that don't come from electric currents.
它们表明，变化的电荷会产生磁场，变化的磁场同样能够产生电场。
They state that a moving electric charge will generate a magnetic field while a shifting magnetic field similarly creates an electric field.
我将要讲电场和磁场。
I want to tell you things about electric and magnetic fields.
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.
这些方程以最优雅、最简洁的方式描述了电场和磁场的特性以及电场、磁场与物质互相作用的方式。
These equations represent one of the most elegant and concise ways to state the behaviour of electric and magnetic fields and how they interact with matter.
高空架线的话，由交流电产生的电磁场与地面的感应要比空中的电场交互作用强大得多。
On top of that, the field generated by an alternating current interacts with the ground more strongly than it does with the air.
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.
为了要做那些，CERN建造了反质子加速器，他说，使用电场和磁场把接近光速度的粒子减慢到光速的十分之一左右。
To do that, CERN built the Antiproton Decelerator, which USES electric and magnetic fields to slow the particles from near light speed to about one-tenth of that, he said.
Maxwell方程组是“非对称的”：电场有一个负电极子和一个正电极子，带着不同的电荷；但磁场却没有。
Maxwell's equations are "asymmetrical": electricity has an electron monopole and a proton monopole, each with opposite charge, but magnetism does not.
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；
Although the description of the system involves the electromagnetic potential, the physical properties only depend on the electric and magnetic field-strength.
电场和磁场可以用统一的电磁张量来描述。
Magnetic field and electric field is described by unified electromagnetic tensor.
一种基于声场、电场和磁场相互正交耦合作用的新方法为生物电流检测和医学功能成像提供了新的思路。
A novel method based on the coupling effect of orthogonal sound field - electric field and magnetic field is used for the bioelectric currents detecting and the function imaging of tissue.
这个行为虽然看起来很诡异，但事实上要使电子反抗外加电场及磁场的“推力”，道理却相当简单。
Although this behavior might seem paradoxical, it is actually quite a simple matter to make electrons oppose the "push" of the applied electric and magnetic fields.
本文基于最优化理论，利用模拟电荷法对一个小型的交叉场天线（CFA）进行了场的数值分析，得到CFA周围的电场、磁场及玻印廷矢量的分布。
In this paper, we introduce the basic theory and the design of CFA, and analyze the field of CFA by CSM on the basis of method of optimization.
变化着的电场产生磁场。
变化着的磁场产生电场。
变化着的磁场产生电场。
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