A conducting ring of radius $1$ metre is placed in a uniform magnetic field $B$ of $0.01$ tesla oscillating with frequency $100Hz$ with its plane at right angle to $B$. What will be the maximum induced electric field?

Figure a shows two concentric circular regions in which uniform magnetic fields can change. Region 1, with radius $r_1=1.0cm$, has an outward magnetic field $\overrightarrow{B_1}$ that is increasing in magnitude. Region 2, with radius $r_2=2.0cm$, has an outward magnetic field $\overrightarrow{B_2}$ that may also be changing.
Imagine that a conducting ring of radius R is centered on the two regions and then the emf $\mathcal{E}$ around the ring is determined. Figure b gives emf $\mathcal{E}$ as a function of the square $R^2$ of the rings radius, to the outer edge of region 2. The vertical axis scale is set by ${\mathcal{E}}_s=20.0nV$. What are the rates (a) $d{B}_1/dt$ and (b) $d{B}_2/dt$? (c) Is the magnitude of ${\overrightarrow{B}}_2$increasing, decreasing, or remaining constant?