Recent content by shomey

that's just it, i don't think this is it. notice that the two charge are in the matter eps_0. * the other dielectric is only found at (-d/2 < x < d/2 ). * the two charges are in (x = -d) and (x = +d). so it seems like the force will be F=qE and E=d/eps_0. which is exactly like if there...

someone?? please? I really need help with this...

someone? please? i really need help with this...

suppose I have a charge q at (x=-d) and a charge q at (x=+d). the force between them is q^2/(4*pi*(eps_0)*4*d^2). now, I insert a dielectric (K) between (-d/2<x<d/2), and try to calculate the force now... it seems like it would be the same but it sounds strange... If I use the D field...

Homework Statement suppose I have a charge q at (x=-d) and a charge q at (x=+d). the force between them is q^2/(4*pi*(eps_0)*4*d^2). now, I insert a dielectric (K) between (-d/2<x<d/2), what would be the force between the charges now? The attempt at a solution it seems like it...

I have the feeling I got the first two sections wrong... something about my dealing with the dielectrics. could you have a look and tell me what you think?

I've made progress, I'm stuck with 6/8 equations, could you think about anything I might have missed? thanks!

I solved the question, it's not that difficult after all - just a lot of calculations. solution is attached if you are interested :) if you see an error i would love to know about it.. now - supposed I know the capacitance and the force felt by the upper electrode, and I know all...

Okey so my lecturer had answered to use a small radius spherical electrode instead of a point charge. actually I'm pretty confused, so I'll try to work on it for a little while and let you know if I made some progress and/or have any questions. thanks for the help! shomey

thanks. I've wrote in email to my lecturer asking about it. I'll let you know how it goes...

OK thanks. I was asked to calculate the capacitance of such a system... so you're saying that the question is problematic right?

Consider a capacitor which is just like a plate capacitor, but instead of the upper electrode being a plate it is a point charge Q. the lower plate is held at a fixed potential V=0. how could you calculate the capacitance of the system? when trying to calculate - it looks like it will be 0...

someone? even if you are not sure I will be glad to hear what you think...

Homework Statement I have a capacitor which i just like a plate capacitor, but instead of the upper electrode being a plate it is a point charge Q. the lower plate is held at a fixed potential V=0. I am supposed to calculate the capacitance of the capacitor. The Attempt at a...

Hey guys! I think I've solved it, attached is my solution. I have some last little points I would love to understand better: 1) why is the field D contant though the capacitor? (I've read it in a notebook but could not understand why this is true - they've claimed it is because of the...