Consider a solenoid of length L and radius R, where R«L A steady-current flows through the solenoid. The magnetic field is uniform inside the solenoid and zero outside. L/2 L Among the given options, choose the one that best represents the variation in the magnitude of the vector potential, (0, A¸,0) at z= L/2, as a function of the radial distance (r) in cylindrical coordinates. Useful information: The curl of a vector F , in cylindrical coordinates is VXF(r.9.z)=f OF, ƏF, 1[õ(rF,) _ aF, r ôp ôz or (a) (b) R R 14, †A, (c) (d) R R

Consider a solenoid of length L and radius R, where R«L A steady-current flows through the solenoid. The magnetic field is uniform inside the solenoid and zero outside. L/2 L Among the given options, choose the one that best represents the variation in the magnitude of the vector potential, (0, A¸,0) at z= L/2, as a function of the radial distance (r) in cylindrical coordinates. Useful information: The curl of a vector F , in cylindrical coordinates is VXF(r.9.z)=f OF, ƏF, 1[õ(rF,) _ aF, r ôp ôz or (a) (b) R R 14, †A, (c) (d) R R