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Electromagnetic field energy "paradox"
The starting point is the energy density in electromagnetic fields:
$$ u = \frac{1}{2} \left( \epsilon_0 |\mathbf{E}|^2 + \frac{1}{\mu_0} |\mathbf{B}|^2 \right) \tag{1}$$
The "paradox" is if we use ...
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Entropy reversal in magnets
Entropy is an irreversible phenomenon without any energy supplied to reverse it.
I was reading about paramagnetic substances and how dipoles align inside them on application of magnetic field.
My ...
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