Podcast #128: We chat with Kent C Dodds about why he loves React and discuss what life was like in the dark days before Git. Listen now.
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Your question about QM is not clear at all and I won't try to answer it. But the part about, where does the magnet find the energy to rotate: if it is now in a position that is not the lowest energy one, someone, the experimenter, you for instance, put it there. It took that person some work to put it there the way it is. This work has been stored as ...


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Sources of magnetic field: this can be seen from the Maxwell equations: $$ \nabla \times \mathbf{H} = \mathbf{J} + \frac{\partial\mathbf{D}}{\partial t} $$ The first term on the right side gives the generation via electrical current and the second term via an oscillating electrical field. Also, a changing magnetization in space gives rise to a magnetic ...


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The number that comes after the "$\pm$" sign, is the uncertainty in the value (commonly the standard deviation for Gaussian distributions, for other distributions other measures are usually given, Lorentzian distributions for example, have undefined standard deviation and usually use the full width at half maximum). The difference between the values (means) ...


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