physics question #1310



Michal Jaworski, a 18 year old male from Calgary asks on March 6, 2003,

Q:

A black hole is a central point the size of a pinhead where a huge amount of mass is concentrated. If, by the two equations F=(GMm)/r^2 and F=(kQq)/r^2, mass and charge are in the same relationship in universal law, can there be such a thing as a huge charge compressed to a very tiny point just as a black hole is?

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the answer

William George Unruh answered on March 6, 2003, A:

a) Like charges repel, while like masses attract. Thus it is hard to bring charges together, and it would take an infinite amount of energy to concentrate charges into a point.

b) A black hole is more complex than just a huge mass squeezed into a time volume. Because gravity alters the way inwhich time and space are defined, a black hole is not a mass squeezed into an arbitrarily small size. Rather one gets a horizon formed at a radius of 2GM/c^2. Because electromagnetism does not involve space or time alterations, you do not get the same thing happening for charges.

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