A Long Solenoid with 15 Turns Per Centimeter Has a Core

Multiple Choice

A long solenoid with 15 turns per centimeter has a core of annealed iron.When the current is 1.00 A,the magnetic field inside the iron core is 2.46 T.The magnetization M is approximately

A) 1.80 $\times$ 10^-4 A/m
B) 1.31 $\times$ 10⁶ A/m
C) 1.96 $\times$ 10⁶ A/m
D) 5.56 $\times$ 10^-4 A/m
E) 1.50 $\times$ 10⁴ A/m