About
Content
Store
Forum

Rebirth of Reason
War
People
Archives
Objectivism

Post to this threadMark all messages in this thread as readMark all messages in this thread as unreadBack one pagePage 0Page 1Page 2


Sanction: 2, No Sanction: 0
Post 40

Tuesday, August 24, 2004 - 2:01pmSanction this postReply
Link
Edit
Mr. Stolyarov,

Thank you for the interesting discussion. These kinds of issues fascinate me.

Another comment on the fields. From a theoretical sense, the further away you "held" two particles of opposite charge, the stronger the potential energy or attraction between them. Now, on paper, this could be carried on to an infinite point. However, in the real world this is not what's observed.

I've always thought that the difference between mathematical models, and what we observe in the real world, is extremely interesting.



Sanction: 3, No Sanction: 0
Sanction: 3, No Sanction: 0
Post 41

Tuesday, August 24, 2004 - 2:15pmSanction this postReply
Link
Edit
Mr. Stolyarov, Mr. Jeremy Nix, Mr. Firehammer,

I have seen only the last few postings, so I could be misinterpreting your conversation. However, a few of the statements sounded inaccurate. So this is just to state the classical 'interpretations' of electromagnetic field:

1. A field, such as an electrostatic field, is postulated to exist *irrespective* of the presence of other charges. But you measure it *using* a second charge.

2. Jeremy Nix wrote: "To speak purely theoretically, a field would do nothing unless another entity entered it. "

This is not quite accurate: fields generated by one object can propagate and therefore transfer (dissipate) energy without the presence of a second one. An antenna radiating in free space is a classic example; the energy radiated by the antenna is lost forever unless received by another antenna. In other words, a radio station can transmit John Lennon's "Imagine" even if there are no radios to receive it:) Sun would still be radiating heat and light even if there were no earth to receive it.

In fact, this is what made the field interpretation more acceptable compared to the action-at-a-distance interpretation of Newton.

coaltontrail




Post 42

Wednesday, August 25, 2004 - 5:55amSanction this postReply
Link
Edit
I don't really have enough physics knowledge to continue this discussion, but when I said that "a field would do nothing" what I meant was "a field would have no effect on something else." Energy doesn't really "do" things by itself. It has to have something to act on.



Post to this threadBack one pagePage 0Page 1Page 2
User ID Password reminder or create a free account.