Recent content by THE HARLEQUIN

Thanks eq1 for your reply. I tried to solve the built in potential part, though not sure if it's the correct approach. The gradient is given in the question as the parameter 'a' . the problem is from Neamen's semiconductor physics and devices exercise. I attached the photos of my solution...

Hello guys, I stumbled upon this problem while studying non uniformly distributed pn junctions and finding difficulty solving this. Any help will be greatly appreciated. A diffused silicon p-n junction has a linearly graded junction on the p side with a = 2 x10^19 cm-4, and a uniform doping of...

hmmm i have derived a proof.. but don't know if its ok :/ btw it would be great if u could explain this "sum of divergence of the electric field throughout the volume is sum of the flux through the surfaces " with some animation or something. i know they will be the same but having trouble...

thanks andrewkirk ... i have seen this already .. but the problem is i am not familiar with the sifting property ... think you have any simpler process of deriving this ?

Hi , while trying to prove gauss law for electric field from gauss theorem i came up with this problem . as Gauss' differential law expresses ∇⋅E = ρ/εο what i get from that is ... the divergence of electric field which is the flux density is related to the charge density ...but i can't get...

actually Chrisver meant that even if the electron doesn't have " rotation about its own axis " it ll still have spin...

have read this article several times .. it doesn't say why ... and moreover how can we visualize something to have magnetic moment which is not rotating at all .. ?

ok .. i agree with that .. but won't the electron magnetic moment be zero if the electron stops rotating ? or am i wrong ? or can't we do the reverse ( like by forcing the magnetic moment to be zero can't we stop the rotation ?) ?

if we put aside the spin ( that is the net vector because of the forces acting on the electron ) , and work with the " spin angular momentum" , now what actually makes it spin ? and is this spin also intrinsic ? ( i mean even if electron is stopped does it keep spinning ? like a cathode ray...

even if we choose classical model , it can be explained why electron doesn't radiate energy .. if the the path the electron chooses to rotate is taken as it has same potential (v) everywhere then the net work for movin an electron will be ( w = dvxI = 0xi=0 ) so therefore no energy is lost ...

so this basically means that .. electron around an atom can't exist without this angular momentum.. right ? what if a magnetic field is introduced which only affects the "spin angular momentum " of the electron and forces it to stop spinning , won't the electron still continue to rotate around...

define this " intrinsic property " ... so are you saying that spin isn't due to the angular momentum w.r.t. the axis passing through the electron itself ?

okay , this question might look a little silly .. But i have been wondering about this for a while .. i know electrons move around the orbit because of the electrostatic force between electron and proton .. But what what makes an electron rotate about its axis ? i believe even without the spin...

thanks .. that was helpful ... i also want to know if the spacecraft 2 has the same velocity as the rocket will the age of the man in in the spacecraft and the man in the rocket differ ? if it does then by what factor ?

two spacecraft s travel parallel to each other along straight lines AB and CD as shown in the picture here ... while s1 moves with a simple harmonic motion , s2 moves with a constant speed and only at points A and B it gets enough thrust within a very negligible time to reverse its direction of...