A coil is placed perpendicular to a magnetic field of \( 5000 \, \text{T} \). When the field is changed to \( 3000 \, \text{T} \) in \( 2 \, \text{s} \), an induced emf of \( 22 \, \text{V} \) is produced in the coil. If the diameter of the coil is \( 0.02 \, \text{m} \), then the number of turns is the coil is:
