Monday, February 13, 2017

electromagnetism - Magnetism and Photons


Knowing that magnetic field is made from photons. Where does a magnet gets it's photons from to create a magnetic field. Are the photons created within the magnet, or does the magnet capture photons from the outside?




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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 \...