Given:
The radius of the coil, r=7 cm=0.07 cm
The number of turns, N=40
The field passing through the coil, B=0.900 T
The time interval, t=0.200 s
To find:
The induced emf.
Step-by-step explanation:
The emf induced is given by the equation,

Where A is the cross-sectional area.
On substituting the known values,

Final answer:
Thus the emf generated in the wire is 2.77 V