Walker, Halliday & Resnick — Maxwell's Equations; Magnetism of Matter: Problem 2

2 Nonuniform electric flux. Figure 32-19 shows a circular region of radius \( R = 2.00 \text{ cm} \) in which an electric flux is directed out of the plane of the page. The flux encircled by a concentric circle of radius \( r \) is given by \( \Phi_{E,\text{enc}} = (0.600 \text{ V} \cdot \text{m/s})(r/R)t \), where \( r \le R \) and \( t \) is in seconds. What is the magnitude of the induced magnetic field at radial distances (a) \( 2.00 \text{ cm} \) and (b) \( 5.00 \text{ cm} \)?