电磁场与电磁波shijuan(3页).doc

《电磁场与电磁波shijuan(3页).doc》由会员分享，可在线阅读，更多相关《电磁场与电磁波shijuan(3页).doc（3页珍藏版）》请在淘文阁 - 分享文档赚钱的网站上搜索。

1、-1.2.3.4. 电磁场与电磁波shijuan-第 3 页5. 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 Theorem

2、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 conduction disp

3、lacement 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 bound volu

4、me 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 lossless t

5、ransmission 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 magnetic flux of C1 a

6、nd 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 2GHz,if the siz

7、e 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 to the direction

8、 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 direction of magn

9、etic 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 conductivity chemically1

10、8. 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 .20.please explain

11、 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 wr

12、ite down the constitutive equations when the medium is linear,hormogeneous and isotropic.23 .On the interface of two different mediums,when free electric charge areal density,and surface current density are given,please write down the vector expressions of boundary conditions of (diagrammatic presentation is required).