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Physics question, is a true DC or constant magnetic field truly possible?

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BrianHG:
Well?  I guess you might call this a philosophical question, but, no matter the power source creating your DC power, it will eventually die meaning no longer a DC signal as it has an AC attribute.  (Heat death of the universe and all that...)  Even a permanent magnet's field fades over time, hence they are not truly constant.

Can we or the universe ever achieve an authentic 0hz unchanging charge with 0 AC characteristics?

shapirus:

--- Quote from: BrianHG on March 28, 2024, 12:38:39 am ---Can we or the universe ever achieve an authentic 0hz unchanging charge with 0 AC characteristics?

--- End quote ---
unchanging charge = zero current.

SiliconWizard:
It's not just that it will eventually die, but it constantly changes, sometimes with changes small enough that you call that "DC".

BrianHG:

--- Quote from: shapirus on March 28, 2024, 12:40:55 am ---
--- Quote from: BrianHG on March 28, 2024, 12:38:39 am ---Can we or the universe ever achieve an authentic 0hz unchanging charge with 0 AC characteristics?

--- End quote ---
unchanging charge = zero current.

--- End quote ---
Ok, you didn't understand what I was asking.
It is possible to have a so called unchanging charge with a load current if we continuously refill our reference charge.
But even in our experiment if we consume no current, eventually something in the universe should kill it.
even Magnatar stars loose their magnetic field over time.

m98:
No need to get as philosophical as to considering the lifetime of the universe, a DC signal is what you define it to be, it is always a highly idealized description of the actual signal. There are no true DC signals, they are a spherical cow in a vacuum. There seem to be perfectly constant charges, every single electron seems to be holding its charge quite well, its only when you look at more than one charged particle that things start to get complicated.

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