Recent content by the-brammo

Did you click on it before I edited the link? I originally posted an incorrect link.

http://www.electronics-tutorials.ws/opamp/op-amp-multivibrator.html I think this site explains it pretty well, try to understand the hysteresis curve/plot. The input could be a varying value, maybe you should think about using an inequality? I think the answer warrants a more qualitative...

Thanks so much, this answers my question perfectly.

Is this a hint? I know there are some steps are missing, does a factor of two comes out when the divergence of s is taken in cylindrical coordinates?

The question reads: A fat wire, radius a, carries a constant current I, uniformly distributed over its cross section. A narrow gap in the wire, of width w << a, forms a parallel-plate capacitor. I have drawn a red box at the bottom of the page where the Poynting theorem is supposedly verified...