電磁場(chǎng)與電磁波shijuan

1、-作者xxxx-日期xxxx電磁場(chǎng)與電磁波shijuan【精品文檔】1. Lame Constants in the rectangular spherical cylindrical coordinate system Position Vector in the rectangular spherical cylindrical coordinate system 2. The formula to represent the relationship of directional derivative and gradient.In vector analysis ,Stoks Theo

2、rem shows that_. In vector analysis,Gauss divergence theorem shows that_.3.Differential equation of vector line of vector field in the rectangular coordinate system .4Integral& differential form of total current law .5.The expression of conduction current volume density.the expression of conduct

3、ion displacement current volume density.6.In magnetic medium,if the intensity of magnetization is given,the bound surface current density is _,and the bound volume current density is_ .7.In dielectric medium,if the intensity of polarization is given, the bound surface choose density is _ ,and the bo

4、und volume charge density is _. Energy density of electric field is_.In time varying EM field ,what does represents?While in time harmonic EM field ,while is independent with time represents _. 9. Change the complex vector into instantaneous form .10.Write the two basic functions of antenna .11.A lo

5、ssless transmission line with short circuit terminal ,whose length is 1.2m and working wave length is 0.5m,is equivalent to a _.(capacitor or inductor)12.Two current loops C1& C2are close to each other .The currents passing through the loops are I1 &I2,respectively .If the interlinkage magne

6、tic flux of C1 and B1 ,the magnetic field generated by I in C,is ,the mutual inductance.M21= _and the self -inductance M11=_ .13.the concept of skin effect and skin depth .14what is the dominant mode of rectangular waveguide?The waveguide is filled with air .And the frequency of the signal source is

7、 2GHz,if the size of its cross section is a*b=72mm*30mm,the possible propagation mode is /are _.15Which of the following vector identities is wrong.16which is the following methods can produce induced current in circular wire coil moving in uniform magnetic fieldA the wire will coil moves parallely

8、to the direction of magnetic fieldB The sire coil moves parallelly to the vertical direction of magnetic field C the wire coil rotates around one radius of the coil,which is parallel to the direction of magnetic field D the wire coil rotates around one radius of the coil,which is pendicular to the d

9、irection of magnetic field. 17. which is following statements is not true of the method to reduce ground resistance ?A.Increasing the area of ground electrode B.Utilizing multiple long and thin conductors covering evenly on the ground C.Increasing the soil conductivity D.Decreasing the soul conducti

10、vity chemically18. According to its basic equations in integral form ,electrostatic field constant magnetic field time varying field is( ).Adivergent irrotational Bsolenoidal irrotational Csolenoidal rotational Ddivergent ratational19. Change the plural the form of vector field into instantaneous .2

11、0.please explain why the TE/M wave can not propagate in regular metal waveguide .21.Please sketched the concept and significance of helminoltz theorem.22.Please write down the integral and differential forms of Maxwell Equations of time varying TE/M field point out the physical signtficances of each equation And write down the constitutive equations when the medium is linear,hormogeneous and isotropic.23 .On the interface of two different mediums,when free