Answer:
So magnetic field will be equal to 0.1144 T
Explanation:
We have given frequency f = 60 Hz
Maximum emf e = 5500 volt
Number of turns N = 150
Area 
Emf generated in ac generator is given 
For maximum emf 
So maximum emf will be equal to 

So magnetic field will be equal to 0.1144 T
The correct answer is consequent.
Hope i helped :)
Time = distance/speed
Time = (175 m) / (320 m/s)
<em>Time = 0.547 second</em>