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Consider a capacitor with circular parallel plates that have radius r and are separated by a distance d. The capacitor is being charged linearly in time with a constant current I so that q(t) = It.
(a) Determine the electric field within the capacitor as a function of time
(b) Determine the magnetic field within the capacitor as a function of time based on Ampere's law in the following form: ∫B→.ds→ = μ0ε0dΦE/dt which holds where there is no actual charge current as between the capacitor plates. (Hint: The magnetic field lines are circular within the capacitor)
(c) Determine the Poynting vector S→ = 1/μ0 E→ x B→ on the surface of the cylindrical volume between the capacitor plates (curved part and on the bases of the cylinder). Make a sketch to illustrate the pattern formed by S→.
(d) Determine the rate at which energy is flowing into the capacitor by calculating ∫S→.dA→ over the surface of the cylindrical volume between the capacitor plates (hint: Notice and describe how the integral simply turns into a product of the value |S| on the curved surface time the area of that surface.)
(e) compare the result of problem (d) to the rate at which the energy stored in the capacitor is increasing.
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