Sunday, April 1, 2018

electromagnetism - Why is Kirchoff's Current Rule valid?



The fact that Kirchoff's Current Rule is valid means that whatever current flows in flows out. But this will only be valid for a steady current circuit, that is, when there is no accumulation of charge. But there is no reason why there shouldn't be even small accumalation of charge and therefore inconsistencies in current, is there? Somehow it all just doesn't seem very intuitive. Am I looking at something the wrong way? Is there a proper explanation?




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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 \...