f = 60 Hz
V = 120 V
A = 0.0030 m2
N = 500
We now for a generator,
V = NBAW/sqrt(2) <------- rms value of emf
where, W = 2*pi*f
So, V = 500*B*0.0030*(2*pi*60)/sqrt(2) = 120
So, B = 0.3 T <--------answer
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