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thank you very much Doc al it is as what you mentioned related to the current density for c and d the current is the same whereas in b smaller and a is even smaller than b Sometimes we think in very difficult method when we can solve it in easier way Thank you again and regards

Hellow every one I have small Q but I stuck on it there is pic attachedhope to be intersting and clear to you Homework Statement rank the loops accoroding to the current enclosed greatest first Homework Equations we have three eqn's B = u "node" I encِْْْْ B = u"node" i / 2 pi r...

thank you very much I have solved the problem

I think you can assume that one of the charges to be negative and the other is negative and it will give you the right answer.. and welcome to PF.

Homework Statement When a wave travels through a medium, individual particles execute a periodic motion given by the equation : y = 4.0 sin[ pi/4(2 t + x/8)] where y and x in meters and t in seconds the phase difference at any given instant are 20.0 m apart is