Recent content by DDesulgon

Thanks for your reply! Unfortunately, I can't follow your math :) I get 0.053 m^2 for the area. Then, with a plate spacing of 0.1 mm, I get a capacity of 4.7 nF (assuming it's filled with air). However, I only get to 350 mJ at a voltage of approx. 12 kV. Shouldn't it be possible to stay well...

Hello, I am starting to teach about plate capacitors and have a few questions. I am using this model: https://www.phywe.com/physics/electricity-magnetism/electrostatics-electric-field/plate-capacitor-d-260mm_1000_1931/ 1) As I understand it, the left plate is electrically insulated, while the...

That's interesting! It seems that I have found the perfect person for my question :) In summary, which variation would you favor for classroom implementation?

That seems a bit cumbersome for me as well. But I'm amazed by the amount of your ideas ;)

No, unfortunately nothing like that.

They are roughly 16. I have thought about the "safety" students, too - I don't know what's best, really ;) What's your favourite?

To be honest, I'm rather skeptical about that. What do you think about the benches? Or a completely different idea: Students sit on the floor and brace their feet against each other while pulling on the hemispheres. Or can the head hit the floor then? Maybe I'm worrying too much, but I'd rather...

Yeah, I have this kind of immovable experiment benches.

They are quite small, with a diameter of about 10 cm. I have not measured the force; two strong men can separate the hemispheres with some effort. Do you think it makes sense for both of them to hold onto a table with one hand? Or is the recoil then so strong that this rather leads to an injury...

I would like to show students the Magdeburg hemispheres and ask for two volunteers to try to separate the hemispheres. In doing so, however, I am concerned that if the students actually succeed, they may fly off to the back and possibly injure themselves. How would you avoid this - for example...

I did it as described above and it worked nicely. Thank you all for the quick and excellent help, as always.

Thanks for the answers and the link! Unfortunately I cannot find the information about the pump and the bell jar online. Do I understand it correctly that the following way is safe? - Pump off air - Close the valve between the pump and the bell jar - Switch off pump - Remove the hose from valve...

Hello, I would like to carry out a few experiments with a vacuum pump under a vacuum bell jar. However, I have no experience with this and the operating instructions could only help me to a limited extent. Specifically, I am interested in the sequence for switching off the pump: When I have...

Thanks for your ideas! Of course, I have already tried your first suggestion. I really saw some gossamer lines, but wasn't sure if they were really Fraunhofer lines. Especially since I also saw some horizontal black lines because the slit was set so narrow. Your second suggestion sounds good, I...

The concept sounds good. Unfortunately, I don't have a professional spectroscope, only a small handheld one. Is it also possible to project the spectrum onto a screen using a slit, a lens and a grating?