Question

An infinitely long, straight, cylindrical wire of radius R carries a uniform current density J. Using symmetry and Amperes law, find the magnitude and direction of the magnetic field at a point inside the wire. For the purposes of this problem, use a cylindrical coordinate system with the current in the +z-direction, as shown coming out of the screen in the top illustration. The radial r-coordinate of each point is the distance to the central axis of the wire, and the angular direction at each point is perpendicular both to the +z-direction and to the r-direction as shown. What is the magnitude of the magnetic field at some point sectional view cross inside the wire, at a distance ri<R from the central axis? Express your answer in terms of R, r, uo, and J. Assuming Jis positive, what is the direction of the magnetic field at some point inside the wire? O positive z direction O negative z-direction O positive r-direction O negative r-direction O positive direction O negative direction side view

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