Figure 30-73 a shows two concentric circular regions in which uniform magnetic fields can change. R…

Figure 30-73 a shows two concentric circular regions in which uniform magnetic fields can change. Region 1, with radius r_1= 1.0 cm, has an outward magnetic field B⃗_1 that is increasing in magnitude. Region 2, with radius r_2= 2.0 cm, has an outward magnetic field B⃗_2 that may also be changing. Imagine that a conducting ring of radius R is centered on the two regions and then the emf ℰ around the ring is determined. Figure 30-73 b gives emf ℰ as a function of the square R^2 of the ring #x27;s radius, to the outer edge of region 2 . The vertical axis scale is set byℰ_s= 20.0 nV. What are the rates (a) d B_1 / d t and (b) d B_2 / d t ? (c) Is the magnitude of B⃗_2 increasing, decreasing, or remaining constant?

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