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- Newsgroups: sci.space
- Path: sparky!uunet!usc!sdd.hp.com!mips!darwin.sura.net!convex!schumach
- From: schumach@convex.com (Richard A. Schumacher)
- Subject: Re: A 12 mile tether that generates 5000v?
- Message-ID: <schumach.712610300@convex.convex.com>
- Sender: usenet@convex.com (news access account)
- Nntp-Posting-Host: starman.convex.com
- Organization: CONVEX Computer Corporation, Richardson, Tx., USA
- References: <1992Jul31.054058.15957@mnemosyne.cs.du.edu> <2182@tymix.Tymnet.COM>
- Date: Fri, 31 Jul 1992 19:18:20 GMT
- X-Disclaimer: This message was written by a user at CONVEX Computer
- Corp. The opinions expressed are those of the user and
- not necessarily those of CONVEX.
- Lines: 19
-
- In <2182@tymix.Tymnet.COM> filfeit@rael.Tymnet.COM (Fil Feit) writes:
- [quotes description of voltage induction in a conductor]
-
- >it seems that this must operate with about an 80% efficiency to get 5KV
- >over 15KM. That seems like alot to hope for.
-
- Not applicable: efficiency won't come into it unless you try to extract
- power from this long skinny generator. A static voltage will be created
- without any worry about efficiency.
-
- > And isn't there an inverse
- >square rule governing magnetic strength? Is this accounted for in that .5
- >Gauss figure?
-
- More like inverse cubed, since the Earth's field is mostly dipole, but it
- still doesn't matter much: the shuttle is already 8000 km away from the
- center of the magnet, so the 15 km length of the tether makes little
- difference. (8015/8000)**3 = 1.00562
-
-