Recent content by tom_

Could it be this?: https://www.researchgate.net/deref/https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FBlack_drop_effect I noticed that the shadow of the ruler is actually very sharp. Nevertheless, you can see how it bulges out, as if the light rays that pass directly the edge of the CD are slightly...

The experiment was not performed by me. I just was not able to give a reasonable answer, so I asked here. He means, that the CD is completely metallized. The light source is the sun. Furthermore he writes that the shadow of the first object is always moving inboard and the shadow of the second...

No. Take formula ##\vec{F}_W## and set the relative velocity ##\vec{v}=\vec{0}##. You see that the Weber force becomes the Coulomb force, i.e. the net electromagnetic force is only caused by the E-field for ##\vec{v}=\vec{0}##. Set now ##\vec{v}=(0.01,0,0)c##. From this follows...

In the picture a CD is held in front of a ruler. The light source is an ordinary lamp. You can see a shadow of the CD on the ruler. Remarkable is the shadow on the screen behind it, because you can see that the CD is fully visible and the ruler bulges instead. Does anyone know this optical...

Let me answer your question as an electrical engineer. First you should realize that ##\vec{B}## and ##\vec{E}## cannot be measured directly. One can only measure their effects and these consist in the fact that the fields exert forces onto charges. By definition, E fields act on resting and...