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A long straight wire carries a current of 35 A. What is the magnitude of the field B at a point 20 cm from the wire?

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Current in the wire `I=35A` , Distance of a point from the wire `=r=20cm=0.2m`
Magnitude of the magnetic field at this point is givenn as `B=(mu_(0))/(4pi)(2I)/r`
Where `mu_(0)=` Permeability of free space `=4pixx10^(-7)TmA^(-1), B=(4pixx10^(-7)xx2xx35)/(4pixx0.2)=3.45xx10^(-5)T`
Hence, the magnitude of the magnetic field at a point 20 cm from the wire is `=3.5xx10^(-5)T`
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