Phys 102!

An infinitely long straight conducting cylinder of radius 4R lies along the z-axis. The current density in the cylinder is J along the +z axis and uniform over the cross-section. Find the magnitude and direction of the magnetic field at point A. y 4R OJ A X Select one: a.HoJR, -y-axis b.2HoJR, +x-axis C.HOJR, -x-axis d.2HoJR, -y-axis e.2HoJR, -x-axis f.HOJR, +x-axis 9.HoJR, +y-axis h.2MoJR, +y-axis