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consider a long straight wire of cross section area A carrying a curent i. let there be n free electrons per unit volume , an observer sitting in the car moving in thw same direction with a speed of v=i/nAe and seperated from the wire by a distance r. the magnetic field seen by the observer is ???

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The observer's relative velocity with respect to the electron is 0.

the magnetic field as seen by the observer is very nearly to \frac{\mu_0 i}{2pr} 
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HARSH KANKARIA

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