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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?

2. 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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The magnitude of the magnetic field at a distance r from a long straight wire carrying current I is given by,

|B|=\frac{\mu _{0}I}{2\pi r}

In this case

|B|=\frac{4\pi \times 10^{-7}\times 35}{2\pi\times 0.2}=3.5\times 10^{-5}T            (current=35A, distance= 0.2m, permeability of free space = 4\pi \times10-7 TmA-1)

 

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