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The current density  inside a long, solid, cylindrical wire of radius a = 12 mm is in the direction of the central axis and its magnitude varies linearly with radial distance r from the axis according to  where A/m2. Find the magnitude of the magnetic field at r = a/2 in μT.
    Correct answer is '10'. Can you explain this answer?
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    The current density inside a long, solid, cylindrical wire of radius a...
    Current in the element = J (2πr . dr)
    Current enclosed by Amperian loop of radius a/2


    Applying Ampere's law

    On putting values
    B = 10 μT
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    The current density inside a long, solid, cylindrical wire of radius a = 12 mm is in the direction of the central axis and its magnitude varies linearly with radial distance r from the axis according towhereA/m2. Find the magnitude of the magnetic field at r = a/2in μT.Correct answer is '10'. Can you explain this answer?
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