Friday, September 25, 2015

electrostatics - What happens to 5 electrons on a sphere?


Let's suppose we put 5 electrons on a perfectly conducting (no resistance at all) sphere.


There's no equilibrium configuration with 5 (though there is with 2, 3, 4 or 6). So will they keep moving on the sphere for ever ?





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classical mechanics - Moment of a force about a given axis (Torque) - Scalar or vectorial?

I am studying Statics and saw that: The moment of a force about a given axis (or Torque) is defined by the equation: $M_X = (\vec r \times \...