Ahollow cylinder with an inner radius of 3 mm and an outer radius of 25 mm conducts a 4-a current flowing parallel to the axis of the cylinder. if the current density is uniform throughout the wire, what is the magnitude of the magnetic field at a point 11 mm from its center? (μ 0 = 4π × 10-7 t · m/a)

"i have always loved contemporary art and made it a general goal to work within the field. after a few nonprofit internships at museums and galleries, i decided to try the for-profit art world and was offered a job as the ad assistant at the magazine. i much prefer the pace of the for-profit art community and have stayed with the company for three years, with a promotion to an account manager last spring."

i just did this and got a 100.