A Flat Coil Is Wrapped with 200 Turns of Very $\vec { B }$

Multiple Choice

A flat coil is wrapped with 200 turns of very thin wire on a square frame with sides 18 cm long.A uniform magnetic field is applied perpendicular to the plane of the coil.If the magnitude of the $\vec { B }$ field changes uniformly from 0.50 T to 0.00 T in 8.0 s,find the emf induced in the coil.

A) 2.1 mV
B) 4.1 mV
C) 0.21 V
D) 0.41 V