Answer
$emf_{max}=5.50kV$
Work Step by Step
We know that;
$emf_{max}=NAB\omega $
We plug in the known values to obtain:
$emf_{max}=100(0.50)(0.30)(3.5)(2\times 3.1416\times\frac{ 1000}{60})$
$emf_{max}=5.497\times 10^3=5.50\times 10^3=5.50kV$