Answer
${\bf 26.2}\;\rm mV$
Work Step by Step
We have here a loop and a changing flux, so we must have an induced current.
We know that the induced emf $\varepsilon$ is given by
$$\varepsilon=\left|\dfrac{d\Phi}{dt}\right|$$
where $\phi =AB\cos\theta$ and here $A$ is constant, so that
$$\varepsilon=A\cos\theta\left|\dfrac{dB}{dt}\right|$$
And for $N$ turns.
$$\varepsilon=\pi r^2N \cos\theta\left|\dfrac{dB}{dt}\right|$$
$$\varepsilon=\pi r^2N \cos\theta\left|\dfrac{B_f-B_i}{\Delta t}\right|$$
Plug the known;
$$\varepsilon=\pi (0.01)^2(100)\cos60^\circ\left|\dfrac{1.5-0.5}{0.6}\right|$$
$$\varepsilon=\color{red}{\bf 26.2}\;\rm mV$$
