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[ Consider a long,straight wire of cross...

[ Consider a long,straight wire of cross-sectional area A carrying a current i .Let there be n free electrons per unit volume.An observer places himself on a trolley moving in the direction opposite to the current with a speed v=(i)/(nAe) and separated from the wire by a distance r.The magnetic field seen by the observer is very nearly (a) (mu_(0)i)/(2 pi r)quad (b) zero quad (c) (mu_(0)i)/(pi r)]

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