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An infinite wire havving charge density ...

An infinite wire havving charge density `lamda=10` n C/m is moving along its axis with speed 100 m/s. Find magnetic field at a distance 4 cm perpenducular to wire.

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`B=(mu_(0)I)/(2pid)`
`B=(mu_(0)dQ)/(2pid. dt)=(mu_(0)lamdadx)/(2pi d. dt )=(mu_(0)lamdav)/(2pid)`
`=(4pixx10^(-7)xx10xx10^(-9)xx100)/(2pixx4xx10^(-2))=5xx10^(-12)T`
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