A solenoid of length 1.0 m and 3.0 cm diameter

A solenoid of length 1.0 m and 3.0 cm diameter has 5 layers of windings of 850 tftms each and carries a current of 5 A. What is the magnetic field at the centre of solenoid? Also, calculate the magnetic flux from a cross-section of the solenoid at the centre of solenoid.