3:26 AM
1

Suppose we have a simple RL circuit. At $t=0$, I close the switch so that current starts flowing in the circuit. When the steady state is achieved, current $i=\frac{\epsilon}{R}$ would be flowing in the circuit due to which an energy $\frac{Li^2}{2}$ will be stored in the magnetic field lines on ...

3 hours later…
6:19 AM
1

I understand that EM waves are oscillating electric and magnetic fields. But doesn't this mean that the wave itself contains charged particles that generate the fields?

7 hours later…
12:53 PM
2

I calculated the surface temperature of the sun using the energy flux of the sun and the Stefan-Boltzmann equation, as is seen in the beginning of this post, but I am confused on how this gives the surface temperature of the sun. Is the T we calculated not the average temperature of the star, sin...

6 hours later…
6:37 PM
1

Why does something round roll down faster than something square? That's a question given to me by my five year old son. So let's not get into detailed discussion about what is 'square' and what is 'round' or what is 'rolling down'. I thought that this might be interesting enough to ask here. Th...

5 hours later…
11:57 PM
1

I get the idea that everything is in motion, and there's no absolute reference frame for everything. But when we consider local events, like a train passing through a town, I have trouble accepting the notion that we have no principled way of asserting the perspective that the train is moving rel...