The permittivity of vacuum is 8.85 times 10-12 c2n middot, Ask an Expert

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A circular parallel-plate capacitor with a spacing of 3.8 mm is charged to produce a uniform electric field with a strength of 2.8 × 106 N/C. The permittivity of vacuum is 8.85 × 10-12 C2/N · m2. What plate radius is required if the stored charge is -1.03 μC?

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