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Magnetic Field

Q- In a long cylindrical wire of radius a = 3.1 mm the current density varies with distance r from the axis as j (r) = j0 (r/a). Here r is the distance from axis and j0 = 310 A/m2 is a constant. Find magnetic field at (a) on the axis of wire (b) at distance a/2 from the axis and (c) at the surface of the wire.

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