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Science > Physics |
| User: |
"" |
| Date: |
22 Dec 2007 02:22:41 AM |
| Object: |
What is the charge limit of a black hole? |
I have read that black holes of mass m cannot have
any electric charge value. There seems to be a charge
limit. What is the formula for this limit?
John
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| User: "Sam Wormley" |
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| Title: Re: What is the charge limit of a black hole? |
22 Dec 2007 09:20:32 AM |
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wrote:
I have read that black holes of mass m cannot have
any electric charge value. There seems to be a charge
limit. What is the formula for this limit?
John
Where and What did you read?
http://scienceworld.wolfram.com/physics/BlackHole.html
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| User: "Eric Gisse" |
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| Title: Re: What is the charge limit of a black hole? |
22 Dec 2007 10:05:03 AM |
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On Dec 21, 11:22 pm, wrote:
I have read that black holes of mass m cannot have
any electric charge value. There seems to be a charge
limit. What is the formula for this limit?
John
Q^2 < GM^2
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| User: "" |
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| Title: Re: What is the charge limit of a black hole? |
22 Dec 2007 10:41:00 AM |
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On 22 Dez., 17:05, Eric Gisse <jowr...@gmail.com> wrote:
On Dec 21, 11:22 pm, wrote:
I have read that black holes of mass m cannot have
any electric charge value. There seems to be a charge
limit. What is the formula for this limit?
John
Q^2 < GM^2
If I understand the article
http://en.wikipedia.org/wiki/Reissner-Nordstr%C3%B6m_metric
correctly, the precise limit in SI units for a non-rotating
black hole is
Q^2 G / c^4 4 pi eps0 < 4 G^2 M^2 / c^4
Or
Q^2 / 4 pi eps0 < 4 G M^2
Or
Q^2 < 16 pi eps0 G M^2
Is that correct?
John
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