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 Apr 15 comment I want to increase pressure of water in a closed vessel Have you considered heating up the container? Apr 12 awarded Commentator Apr 12 comment Why half distance is taken? There is a hill halfway between the towers (distance of 20km), which is supposedly the main source of losses due to diffraction. Apr 12 comment Laser mode locking @Madan Ivan, the second part of your answer only applies to homogeneously broadened media! Multiple modes should have no problem surviving in the cavity simultaneously if the gain medium was inhomogeneously broadened. And even with homogeneously broadened media the laser should have no problem jumping between different modes very quickly due to spatial hole burning. Mar 15 comment Equivalent DC circuit with charged conductors Also, could you please update your answer to include the "black box" explanation so I can mark it as accepted? Mar 15 comment Equivalent DC circuit with charged conductors Thank you, this seems reasonable. I was just wondering, which part of the presented calculations makes that transfer from the original system to a "black box" - I did come up with a correct equivalent circuit after all! Now that I have looked at my problem from this perspective it seems that the "black box" comes into play when $q_L+q_m/2$ is substituted by charge on a plate of the equivalent single capacitor circuit. The initial problem is defined by two variables: potential difference $U$ and charge $q_m$, while the equivalent circuit has only one dimension $U$. Mar 15 comment Equivalent DC circuit with charged conductors can you point out which step in my calculation would be equivalent to stating that I will treat my circuit as a black box? Mar 11 revised Equivalent DC circuit with charged conductors stated the problem more clearly Mar 11 comment Equivalent DC circuit with charged conductors Thank you for your input! Energy loss due to dissipation would indeed be the case if I was comparing energies of the initially charged capacitor $C$ and the circuit with two capacitors in series. In this case, however the whole thing with connecting charged capacitors merely provides means for putting nonzero charge $q_m$ on the marked piece of conductor. The aim is to find equivalent circuit for the situation depicted in my question. I will edit the question to communicate my problem more clearly. Mar 11 asked Equivalent DC circuit with charged conductors Sep 15 awarded Teacher Sep 14 answered Jumping sewer lid - WHY? Sep 14 comment Stimulated emission and coherence Daniel, yes, I am quite familiar with quantum mechanics and the Dirac notation. Also, thanks for the link! That's a really great introduction to the Second quantization! Sep 14 awarded Supporter Sep 13 asked Stimulated emission and coherence Aug 19 comment Spontaneous emission in a system with multiple sublevels Thank you for the reply! This is however not the case of magnetic dipole transitions. The transition between the two levels g and e is electric dipole transition (for example, e and g can be fine structure levels of an atom). I have updated the post to avoid further confusion. Aug 19 revised Spontaneous emission in a system with multiple sublevels Clarified, that here the transition $g-e$ is electric dipole transition. Aug 19 asked Spontaneous emission in a system with multiple sublevels Jan 11 revised Alkali atom in oscilating electromagnetic field short answer added Jan 11 awarded Scholar