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- From: Richard.Mathews@West.Sun.COM (Richard M. Mathews)
- Newsgroups: sci.physics
- Subject: Re: BLACKHOLES IN THE CENTRE OF THE EARTH
- Message-ID: <16ulsiINN5fi@smaug.West.Sun.COM>
- Date: 19 Aug 92 23:35:46 GMT
- References: <Bt6xuL.2K2@ecf.toronto.edu> <1992Aug18.220328.26331@kakwa.ucs.ualberta.ca>
- Sender: richard@smaug.West.Sun.COM (Richard Mathews)
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- anderson@fermi.phys.ualberta.ca (Warren G. Anderson) writes:
- >However, a black hole of a given mass will
- >have limited charge and angular momentum. Thus, the magnetic field of the
- >earth would put a lower bound on the mass of the black hole. It should be
- >relatively simple to determine this bound.
-
- A black hole with magnetic dipole moment, m, and charge, q, must have a
- mass of at least
- q^2 + m^2/q^2
- This, in turn, has a minimum when q is m^(1/2). Thus the minimum mass
- of a black hole with magnetic moment, m, is just 2*m (of course with
- G=c=1). Anybody have a value for the magnetic dipole moment of the
- earth?
-
- Richard M. Mathews G eorge
- Internet: richard@locus.com D epression
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-