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Question: r and 203 there are n point charges each has...

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r and [20%]3. There are N point charges (each has charge q and mass m) with coordinates velocities . N) (a) Write down the current density (F) of this set of charges. (b) Using (a), find out the magnetic moment of this system. Write it in terms of the angular momenta i, of particles. Note:xJF) 、、의 ,r Fig. 1 Fig. 2 I R

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