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A long straight wire carrying current i=...

A long straight wire carrying current `i=10A` lies along y-axis. Find the magnetic field at P(3cm, 2cm,4cm).

Text Solution

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perpendicular distance of wire from P is
`r=sqrt(x^2+z^2)=sqrt(3^2+4^2)=5 cm`
`B_P=(mu_0)/(4pi) (2l)/a=(10^-7xx2xx10)/0.05`
`=4xx10^-5T=0.04mT`
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