a. The electric field strength inside a round flat capacitor filled with a substance with a dielectric constant ε increases linearly with time: E = αt. Determine the magnetic field induction inside the capacitor at a distance r from its center.
b. The voltage across the plates of a flat capacitor increases linearly with time: V = αt. The radius of the plates is r₀, and the distance between them is h. A dielectric cylinder of radius r with dielectric impermeability ε is inserted along the axis of the capacitor. Determine the magnetic field induction on the side surface of the cylinder and on the edge of the capacitor.