Wednesday, January 23, 2019

electrostatics - What causes like electric charges to repel and opposite electric charges to attract at the smallest level?


When talking about charged particles, the law of charge dictates that two particles with opposite charge will attract each other and two particles with the same charge will repel each other.


However, I have never seen why this works. So, on a fundamental level why does the law of charge work? What causes like electric charges to repel and opposite electric charges to attract at the smallest level?




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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 \...