-A Solenoid Is Wound with 470 Turns on a Form

Multiple Choice

-A solenoid is wound with 470 turns on a form 4 cm in diameter and 50 cm long.The windings carry a current in the sense that is shown.The current produces a magnetic field,of magnitude 4.1 mT,at the center of the solenoid.In the figure,the current in the solenoid windings is closest to:

A) 3.5 A
B) 3.0 A
C) 2.6 A
D) 4.3 A
E) 3.9 A