A solenoid 1.7 cm in diameter and 30 cm in length has 4000 turns and carries a current of 5 A. Calculate the magnetic flux(in Wb) through the circular cross-sectional area of the solenoid. Since this is a very long solenoid, you may use the simplified magnetic field formula for the infinite solenoid.
B = µ * N * I
The Attempt at a Solution
B = (4 . π . 10^–7) . (4000 / 0.3) . 5 = 8.4 . 10^–2 T
My online homework is telling me this is incorrect. Im not sure what im doing wrong.