Recent content by entphy

I hope I have captured the question correctly. Yes, having a non-uniform field does not always result in net force. If one creates a non-uniform field using for example an odd asymmetric shape magnet, the force would be acting on itself and the action and reaction simply cancel each other out by...

Thanks Davenn, but I could only see the edit button for my latest post, not the rest of posts above. Not sure if this is due to my browser setting, but it seems that I could only edit the last post. :(

Hi Koss, Actually I didn't post it 3 times intentionally. The fact is the system was stuck when the 1st post was uploaded so I shut down the browser and opened it again. It turned out then 3 posts were uploaded. I tried to delete the 2 repeated posts but could not find the delete/edit...

I am truly aghast by how pathetic you are in this well respect forum that suppose to serve nothing but scientific truth. Obviously your understanding of physics is so poor or none but yet you are so ashame of being exposed, you had to resort to retoric to get your way out. Do you seriously think...

I am truly aghast by how pathetic you are in this well respect forum that suppose to serve nothing but scientific truth. Obviously your understanding of physics is so poor or none but yet you are so ashame of being exposed, you had to resort to retoric to get your way out. Do you seriously think...

I am truly aghast by how pathetic you are in this well respect forum that suppose to serve nothing but scientific truth. Obviously your understanding of physics is so poor or none but yet you are so ashame of being exposed, you had to resort to retoric to get your way out. Do you seriously think...

Magnetic fields certainly interact with each other. Otherwise how do 2 magnets attract or repel each other? If one places a small bar magnet in a larger magnetic field, it's clear that the north and south pole of the small bar magnet would be attracted to the opposite poles of the external field...

I guess the question is which direction is the force on a current carrying wire directed due to its own induced magnetic field interacting with the external applied magnetic field, as there would be no force without the 2 magnetic fields interacting. The direction of the force should then be the...

Thank you very much, appreciate the clear explanation. I hope all textbooks could be more rigorous and state the necessary assumptions much more clearer and explicitly.

Koss's question is a valid question, and the teacher is not misled. The fact is : both the explanations in terms of the Lorentz force on the current carrying conductor, and the force due to the interaction of the external and current carrying magnetic fields are equivalent. I hereby provide the...

Consider an ideal case of a mass m1 moving at constant velocity v1 on a frictionless surface, colliding with another masss m2 at rest. After collision, can someone tell me if it is possible for m1 to move off at -v1 while conserving the momentum and energy of the entire system? This is quite a...

Setting up an alternating electric field across the parrellel plate conductors should create an associated magnetic field as a result. The reason is the electric field in between the plates will be changing and so will be the associated electric flux emanating from the +ve charged electrode to...

I think you certainly can do it this way, by the linearity of the electric field contributed by each layer of charge of sheet density \sigman(zn)=\rho(z)dz, and then sum up (integrated with respect to z) the contribution to the potential of all layer of \rho(z)dz from 0 to z. The mathematical...

I do agree that the solution provided in the 2nd attched diagram could have made a mistake. The horizonal component of the velocity of mass M is not the same as the velocity of the conveyor frame. The distance that M travels over the same period of time is longer than the conveyor frame. The...

I am just thinking of contributing a little of my 2 cents, hope this does not spark off unncessary argument. Dickfore is right. The fact is there really is no contribution from the vertically pointed buoyancy in this picture that concerns only the horizontal linear momentum and center of mass...