Recent content by eman2009

yes, but how we can prove is it a perfect differential!

how we can explain the differential of lagrangian is a perfect ?L dt

how we can explain the differential of lagrangian is a perfect ?L dt

can you give me example ?

if the lagrangian is time homogenous ,the hamiltonian is a constant of the motion . Is this statement correct ?

how about close INT E . da=1/ebsolon Qenc as in Griffiths book(Introduction to Electrodynamic) p.68, equation 2.13 and Q=INT RO dt t(tao) is the infinitesimal displacement dt for cylinder dt=4 pi R^2 dr

Thanks, but what you mean by U, is it the electric potential ? I'm convusing between the notations !

hi i have the same proplem but for hight 2h and radius (a) and charge density ro inside and outside the cylinder and i tryed to use gauss's law and find fy the electric potential but I'm not sure can some one help. i use V(r)=- integrate E.da=E.2pi a (2h) =1/ebslon .Qenc

Hi every one i'm a student in physics and i will take next fall e and m class (electric and megnatic ) and i don't know which book will help me in .i don't have any idea about it ...i prefer to an entrodiction book. Thanks

what the energy spectrum to second order in the field strength for a spherical shell?

can i know why nobody answer me.

Homework Statement find the 1st order correction for the 1st excited state with spin when the H'=(eB0/2mc).Lz+2Sz z the direction this proplem for the charge particleon sphere of radius R with magnatic field B Homework Equations l=1 m=0,1,-1 [b]3. ]The attempt at a...

in the spin matrix if the <A> is real how we can prove the matrix is herimition ,and how we can prove the eigenvalues of any hermition 2x2 matrix is real and its eigenspinors are orthognal if the eigenvalues is defferent and if it is the same? and A physical quantity

for what i use tylar expansion can you clear it please

i think i got the answer is it totally differnet look...v=mgl(1-costhita) H=1/2 ml^2thita'^2+1/2 mglthita^2 and E=(n-1/2)hw but i don't know from where get the E? the lowest correction is H'=v-1/2 ml thita^2=1/24mglthita^4 , how ? E'0=3/4 alpha^4(-1/24mgl/l^3)...how?