Why doesn't the phone compass work so well on a ship?

I once tried the compass function on my phone (Gigaset GS5) on a cruise ship and noticed significant deviations from what the ship's WiFi was reporting. I then experimented a bit and noticed that my phone's compass reacted to the thin metal bars around the windows, even though they're just metal and not magnets… How…

Is this offer real?

This offer includes a magnetic motor that rotates continuously. The words "perpetuum" are used, which I understand to mean permanent dynamics, and the device is the mobile… https://www.amazon.de/Generator-Elektromotor-Permanentmagnet-Windkrafttrieb-Kontinuierlicher/dp/B0C61TGWDS/ ref=asc_df_B0C61TGWDS?mcid=14a07d9a589035e19ed4325a4e315f53&th=1&psc=1&hvocijid=1541917587701193849-B0C61TGWDS -&hvexpln=75&tag=googshopde-21&linkCode=df0&hvadid=696184104678&hvpos=&hvnetw=g&hvrand=1541917587701193849&hvp one=&hvptwo=&hvqmt=&hvdev=m&hvdvcmdl=&hvlocint=&hvlocphy=9042280&hvtargid=pla-2281435176218&psc=1&gad_source=1

DC motor help please?

Hello, I simply don't understand how a DC motor works. I know that it has a stator, which is a permanent magnet and generates a magnetic field, that there's a rotor connected to the coil and has a positive and negative pole, and that there's a stator in the middle of the rotor with two…

My magnets don't stick to a glass magnetic board?

I have a problem. I was recently in Egypt and bought some really great ceramic magnets from a street stall. They look really great. Unfortunately, they don't stick to the wall at home. Everything works perfectly on the balcony railing. But it doesn't work on my magnetic board. But that also has a glass top….

Theoretical physics: Transverse vector wave-elliptically polarized?

Good morning! I have to work on a problem that I don't fully understand. I also posted it on nanolounge, but I haven't received a response yet. https://www.nanolounge.de/40782/beliebige-transversale-ektorwelle-elliptical-polarized I add my task and problem here Task: Here is my problem: