Assignment Versus Equality

Marko Rauhamaa marko at pacujo.net
Tue Jun 28 15:40:48 EDT 2016


Ian Kelly <ian.g.kelly at gmail.com>:

> On Tue, Jun 28, 2016 at 10:39 AM, Marko Rauhamaa <marko at pacujo.net> wrote:
>> Inside the probe, we have a powerful electrical magnet that our
>> compass can detect from a safe distance away.
>>
>> [...]
>>
>> The compass needle shows that the probe is "frozen" and won't budge no
>> matter how long we wait.
>
> I'm skeptical of this. As the ping frequency falls drastically due to
> relativistic effects, so too does the observed current powering the
> electromagnet, does it not?

Actually, that would be a great question for a physicist to resolve.
Next question: would a permanent magnet make any difference?

I admit I changed my thought experiment at the last minute to use a
magnet instead of a charge because I could more realistically imagine a
powerful magnet and a simple detector. That may have been a mistake.

A charge, however, would do the "floating" I presume. It's difficult to
find a straight answer online. The topic of a charge falling into a
black hole is addressed from one angle at:

   <URL: http://adsabs.harvard.edu/full/1971PASP...83..633R>


This is from an answer by a guy who says he's got a PhD in general
relativity:

   there's no problem with information falling IN to a black hole, which
   is allowed to externally display it's mass, charge, angular momentum
   and linear momentum, all of which get inprinted on the horizon as
   matter falls in

   <URL: http://physics.stackexchange.com/questions/6432/gravitational-r
   edshift-of-virtual-photons>

Again, I'd like a physicist to give a straight answer.


Marko


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