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NEET-XII-Physics

04: Moving Charges And Magnetism

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  • #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?
    Ans : Current in the wire, I = 35 A

    Distance of a point from the wire, r = 20 cm = 0.2 m

    Magnitude of the magnetic field at this point is given as:

    B

    Where,

    = Permeability of free space = 4``\pi`` × 10-7 T m A-1



    Hence, the magnitude of the magnetic field at a point 20 cm from the wire is 3.5 × 10-5 T.