One Hundred Turns of Insulated Copper Wire Are Wrapped Around $\pi$

Multiple Choice

One hundred turns of insulated copper wire are wrapped around an iron core of cross-sectional area 0.100 m². The circuit is completed by connecting the coil to a 10- $\pi$ resistor. As the magnetic field along the coil axis changes from 1.00 T in one direction to 1.00 T in the other direction, the total charge that flows through the resistor is:

A) 10^-2 C
B) 2 * 10^-2 C
C) 1 C
D) 2 C
E) 0.20 C