Answer
$Nab = 0.796~m^2$
Work Step by Step
We can find the required value of $Nab$:
$2\pi~f~Nab~B = \mathscr{E}_0$
$Nab = \frac{\mathscr{E}_0}{2\pi~f~B}$
$Nab = \frac{150~V}{(2\pi)~(60.0~Hz)~(0.500~T)}$
$Nab = 0.796~m^2$
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