A Flat Square Coil of Wire with 15 Turns and an Area

Multiple Choice

A flat square coil of wire with 15 turns and an area of 0.40 m² is placed with the plane of its area parallel to a 0.75-T $\vec { B }$ field.The coil is flipped so its plane is perpendicular to the $\vec { B }$ field in a time of 0.050 s.What is the magnitude of the average induced emf in the coil?

A) 6.0 V
B) 36 V
C) 45 V
D) 90 V