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Q. A parallel-plate capacitor with circular plates of radius 0.11 m is being discharged. A circular loop of radius 0.25 m is concentric with the capacitor and halfway between the plates. The displacement current through the loop is 1.6 A. At what rate is the electric field between the plates changing?

Q. A light spring of force constant k = 156 N/m rests vertically on the bottom of a large beaker of water. A 5.55-kg block of wood (density = 650 kg/m3) is connected to the spring, and the block-spring system is allowed to come to static equilibrium . What is the elongation ΔL of the spring?

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