Each plate of an ideal air-filled parallel-plate capacitor has an area of 0.0020 m 2 , and

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Each plate of an ideal air-filled parallel-plate capacitor has an area of 0.0020 m ², and the separation of the plates is 0.090 mm. An electric field of 2.1 x 10 ⁶N/C is present between the plates. What is the surface charge density on the plates?