Hi all! A question I've had for a while: On the surface of the Moon, while under direct sun radiation, is there any way of cooling up an object? There appears to be no natural sh …

The electric field amplitude, and its variations travel in propagation direction. So if does really exist a propagation direction, what happen in other directions? is this wave inf …

Sometimes I see Maxwell's equations in the vacuum written as BOX A_u = 0 where BOX is the d'Alembertian operator. http://en.wikipedia.org/wiki/Maxwell%27s_equations#Four-potential …

Hi, I'm trying to make a connection between physical description of light (involving wave lengths, Poynting vector and energy density) and radiometric quantities:] Radiant energ …

Since the speed of light changes as it passes through a medium, it makes me wonder whether it changes the frequency at all? Since E = hf, if this is the case, then the energy would …

I have two plate capacitors serially connected in a circuit with a battey and a switch between the battery and one of the plate capacitors. I have two situaions: a) I charge the …

Hello everybody. I've been having difficulty in understanding how an electromagnetic wave propagates through space. Firstly, from what I understand, electromagnetic waves are mad …

I've got a magnet of a determinate radius and a coil. Which radius should i give to the coil (in function of magnet radius) in order to obtain the maximum intensity? I think that …

I recently purchased a new microwave oven, and there's a metal rack in it. The salesmen informed me that it shouldn't cause any problems as long as it didn't touch the sides; howev …

Does anyone have an intuitive explanation of Earnshaw's theorem regarding electromagnetic fields? It would help me if a simple example could be used such as 8 point charges one at …