Monday, September 17, 2018

electromagnetism - What is the difference between Biot-Savart law and Ampere's law?



What is the difference between these laws? Which law is more useful? When to use Ampere's law and when to use Biot-Savart law?




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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 \...