Recent content by mahblah

Thanks for all the reply!

Artificial chordae are marked as safe. But usually safe means: "external magnetic field does not exert forces on them". I am instead intrested in the possibility that magnetic field can alter the material. ePTFE is a diamagnetic material (teflon, which is almost te same, has Magnetic...

Hi, I was wondering if a Magnetic Resonance (+contrast) can in some way modify the structure of artificial chordae used in heart surgery. My first answer would be "No". There ain't any medical article about that. Also (as far as i know) I don't think magnetic field can break chemical bond, so it...

Oh that makes sense Thanks!

Hi, i'm trying to solve this problem. It's exercise 3 on page 5 from this book: Challenging mathematical problem with elementary solutions The solution is on page 41: I'm OK with the 4 circles in case 1: i can pick (inside/outside): ABC + D, ABD + C, ADC + B, BCD + A. What i cannot...

Thanks again!

Thanks you both! I think i've somewhat understand what you mean. I have a side question, but probably is meaningless: what can we say about the acceleration of an electron if all space is filled with dB/dt = b > 0 ?

Tough life. Sometimes.

TL;DR Summary: Find acceleration of electron in dB/dt >0 Hello. Here is a problem that i'm not so sure about: Inside a solenoid there is a time-dipendent magnetic field B, so we have dB/dt = b (constant). We want to know the acceleration of an electron: a) placed in the center of the solenoid...

:) Thank u so much TSny!

Homework Statement Hi everybody... i have a bad problem with my brain: starting from the Vectorial form of the magnetic dipole: \vec{B}(\vec{r}) =\frac{\mu_0}{4 \pi} \frac{3 \vec{r} ( \vec{r} \cdot \vec{m}) - r^2 \vec{m}}{r^5} Homework Equations i want to derive the spherical...

Thanks Tsny, ...but it's a simply rename of the index... i mean... i think this is not the problem..

Hi... here it is... sorry for my english... http://sphotos-c.ak.fbcdn.net/hphotos-ak-ash4/297165_4722421629188_964469850_n.jpg

Thanks dextercioby, ...but clicking as a monkey on all the link i have not still found what I'm looking for... :(

I'm sorry if I'm posting this question here, but for some reason i can't add a new topic in the right section (i think it should be "Advanced Physics Learning Materials") ..I'm also sorry for my english... By The Way... Just one simple question: i'm looking for the note or the webpage for...