A Tightly Wound Solenoid Is 15 Cm Long, Has 350 $\mu$

Multiple Choice

A tightly wound solenoid is 15 cm long, has 350 turns, and carries a current of 3.0 A. If you ignore end effects, you will find that the value of _app at the center of the solenoid when there is no core is approximately

A) 3.6 mT
B) 44 $\mu$ T
C) 4.4 mT
D) 88 $\mu$ T
E) 8.8 mT