An MRI (magnetic resonance imaging) solenoid produces a magnetic field of $1.5 \mathrm{T}$. The solenoid is $2.5 \mathrm{m}$ long, $1.0 \mathrm{m}$ in diameter, and wound with insulated wires $2.2 \mathrm{mm}$ in diameter. Find the current that flows in the solenoid. (Your answer should be rather large. A typical MRI solenoid uses niobium-titanium wire kept at liquid helium temperatures, where it is superconducting.)