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## Homework Statement

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.

## Homework Equations

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. I am not sure what I am doing wrong.