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 Figure versus radial distance r; the vertical axis scale is set by Es = 300μN/C, and the horizontal axis scale is set by r s = 4.00 cm. Find a.

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E, r (cm) (3/N)