A circular region in an xy plane is penetrated by a uniform magnetic field in the positive direction of the z axis. The field's magnitude B (in teslas) increases with time t (in seconds) according to B at, where a is a constant. The magnitude E of the electric field set up by that increase in the magnetic field is given by Fig. 30-57 versus radial distance r the vertical axis scale is set by Es = 300 mN / C, and the horizontal axis scale is set by rs = 4.00 cm. Find a.

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0 E,