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- A parallel-plate capacitor with circular plates of radius 0.10 m is being discharged. A circular loop of radius 0.20 m is concentric with the capacitor and halfway between the plates. The displacement current through the loop is 2.0 A. At what rate is the electric field between the plates changing? a) 7.2 x 1012 V m.s b) 2.7 x 10¹2 V. m.s c) 7.2 x 1010 V m.s d) 7.2 x 10² V. m.sUse phasor-form Maxwell’s equations to solve the following problems:4. As noted in the preceding example, the Sun delivers about 1 000 W/m² of energy to the Earth's surface via electromagnetic radiation. (a) Calculate the total power that is incident on a roof of dimensions 8.00 m ×20.0 m. (b) Determine the radiation pressure and the radiation force exerted on the roof, assuming that the roof covering is a perfect absorber.