Thanks!

Thanks!

Thanks!

Thanks for the comment. Although this video had the purpose to show the qualitative relation between induced Eddy currents and material thickness in the same material, this is a good idea. I have never done this experiment with graphite or carbon composite materials (which are typically non-conductive). But if the material is an electrical conductor it should work. Probably the damping force due to the induced Eddy currents may also depend on the degree of anisotropy of the material (metals are typically isotropic for what concerns their electrical properties while graphite or carbon composite materials are not).

Thanks! Nice comment. I will probably do an experiment about the electro-optical Kerr effect soon!

@@scienceotherside2000 awesome! I look forward to it!...learning so much from you

I'm glad you liked it!

Absolutely true, but I will build my own one! Thanks for the idea!

Old style!

Thanks!

Honestly I do not remember now but any kind of audio-board should work fine.

Thanks!

Around 25 cm

Thanks!

Thanks!

Thanks for the ideas and for the safety recommendation! =)

Thanks for the nice comment! =)

It is essentially a trial and error procedure. Try to vary some parameters one at a time (nozzle temperature, plate temperature, nozzle height...) and see if things get better.

Look at the video description!

It is a device to show the magneto-optical effect.

Thanks!!

This is the main reason why I post videos rarely. Because I am buisy playing the Champions League haha.

Thanks!

Yes, you are certainly right. Unfortunately I have recorded the videos a long time ago and I can't find the one that showed the image of the beam without the pinhole. Here you can find more information on spatial filters: www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=10768. The non filtered beam image in my experiment looked like the one represented in figure 2 by thorlabs: a central Gaussian spot (on the optical axis) and side fringes, which represent the unwanted "noise". Hope I have answered to your correct observation!

@@scienceotherside2000 Thanks for a fast reply :). The "noise" you are getting rid of is (I believie) a fine example of the Airy pattern we observe in our telescopes. I just thought it might be interesting to compare the two results, just as a cool educational video :). Thanks for the link!

​@@alganonim Yes, high spatial frequency components are due to diffraction. In the case of my laser these high spatial frequency components arise from higher modes of the laser cavity and diffraction with moisture present in air. Probably in the future I will make a video on the spatial filtering of one of my diode lasers and show both the un-filtered and filtered beams. Diode lasers are rich in high order cavity modes.

I think of the flame as a plasma (maybe not fully ionized). The positive ions are the heaviest ones that actually make up the "mass" of the flame. When a strong electric field is applied this positive ions are attracted to the negative plate of the capacitor, and so the whole flame moves to that direction too.

It is easier than you think. Just buy the correct equipment and connect them as shown in the video!

The aim of this video is just to show qualitatively the fluorescence of Riboflavine (a molecule contained in most energy drinks). I have discovered it by chance, playing with my laser diodes. If you check Riboflavine's absorption spectra you can see that it shows a good absorption around my lasers' wavelength (405nm). In this way I can bring the molecules into an electronic excited state. Fluorescence is then (almost instantly) caused by radiative emission (de-excitation from an electronic excited state to the electronic ground state). The radiative emission occures at a higher wavelenght (less energy) than excitation, the difference between the exitation and de-excitation energies is due to vibrational energies of the nuclei. Again if you want you can check this time the fluorescence spectra of Riboflavine and see that it peaks around 530nm (green) that is what you can see in the video! Hope it is clear! Thanks for the comment!

Yes I know it isn't the safest thing but the voltage I'm using is quite low (36V). I am not using more than 36V for safety reasons, even if in that way I could obtain higher currents and therefore higher magnetic fields.

145A is a high current, but not enough the send large molten metal parts flying that can seriously hurt you. If you wear safety glasses it shoudl be fine.. You will get a burnt spot on your hand max, which will heal in some days. The coil offers enough resistance (as calculated) to limit the current. If you short circuit the batteries directly however, you might get some larger "sparks" :D I once converter a screw driver bit into flying metal parts by shorting out a 24V AGM Lead battery bank of a USV.

Ciao! Ingegneria fisica al Polimi

What are the requirements and conditions please tell me

Please also can you tell me what sort of experties you must have before starting that internship

Please must tell me

Hello! I strongly recommend you to visit Iter website (you can find it in the video description) and possibly contact human resources. They will surely give you better indications than me. Good luck!

Thanks! Probably the alluminium disc wont move in that case (if the magnets are the same and rotating at the same angular velocity). The interaction between the magnetic field produced by the magnets of the upper disc with the one produced by the magnets of the lower disc should be considered. Nice suggestion man!

It was a great experience! Wish you luck bro!!!

Un paio di minuti dopo averlo bevuto ti trasformi in Incredibile Hulk 😂

Hahahahaha

Grandissimo Salve!!!

Gransissimo Ste!!!

I just wanna share! Haha

@@scienceotherside2000 E fai bene! Grandi progetti e bellissimo laboratorio di meccanica

Che bello trovare gente che condivida le tue stesse passioni!!!!!

Thank you very much, I appreciate!

The simplest way is to create a coil with some coated copper wire and attach a permanent magnet to a needle that is free to rotate inside the copper coil you have created. Pay attention to balance the needle in the right way. Then you only have to attach the battery or some other device that delivers current to the two ends of your coil! There are a lot of Web pages that show the building process in a great way. Have fun!

@@scienceotherside2000 thanks. please can you send me these web pages link ? actually i did not find a lot of ressources regarding this topic

@@djibrillamohaman1433 First, I recommend you read on a Website or a physics book how it works. Then you can take a look at this Website: www.doityourself.com/stry/how-to-build-your-own-ammeter. Try otherwise to copy the design I used to build mine. If you have to build it in order to take precise measurments I really suggest you to buy one, Ammeters are really cheap!

Hi! The field used in this video is a static field generated by a permanent magnet. I don't understand what you mean with diamagnetic field. I know that diamagnetism is a property of some kind of materials that behave in a certain way when exposed to an external field, not a property of a field. What do you mean with diamagnetic field??